Difference between Singleton Class and Static Class

Static Class:

1. You cannot create the instance of static class.
   
   
2. Loaded automatically by the .NET Framework common language runtime (CLR) when the program or namespace containing the class is loaded.
   
3. We cannot inherit Static class to another Static class in C#.
   
4. We cannot pass the static class to method.
   

Singleton:

1. You can create one instance of the object and reuse it.
   
   
2. Singleton instance is created for the first time when the user requested.
   
   
3. Singleton class can have constructor.
   
   
4. You can create the object of singleton class and pass it to method.
   
   
5. We can dispose the objects of a singleton class but not of static class.

Dynamic columns width in RDLC

I am trying to generate a RDLC report in ASP.NET where the columns of my Dataset will be dynamic and determined only at run time.

 public DataTable GetTable(int type)
        {
            DataTable table = new DataTable();
            if (type == 1)
            {
                table.Columns.Add("Dosage", typeof(int));
                table.Columns.Add("Drug", typeof(string));
                table.Columns.Add("Patient", typeof(string));
                table.Columns.Add("Date", typeof(DateTime));
                table.Columns.Add("testColumn", typeof(DateTime));

                // Here we add five DataRows.
                table.Rows.Add(25, "Indocin", "Jignesh", DateTime.Now);
                table.Rows.Add(50, "Enebrel", "Sam", DateTime.Now);
                table.Rows.Add(10, "Hydralazine", "Christoff", DateTime.Now);
                table.Rows.Add(21, "Combivent", "Janet", DateTime.Now);
                table.Rows.Add(100, "Dilantin", "Melanie", DateTime.Now);
            }
            else
            {
                table.Columns.Add("Dosage", typeof(int));
                table.Columns.Add("Patient", typeof(string));
                table.Columns.Add("Date", typeof(DateTime));

                // Here we add five DataRows.
                table.Rows.Add(25, "Jignesh", DateTime.Now);
                table.Rows.Add(50, "Sam", DateTime.Now);
                table.Rows.Add(10, "Christoff", DateTime.Now);
                table.Rows.Add(21, "Janet", DateTime.Now);
                table.Rows.Add(100, "Melanie", DateTime.Now);
            }

            return table;
        }


  public ActionResult GenerateReportList()
        {
            var reportDataSource = new List();
            var localReport = new LocalReport();
            var path = GeLocCommon.ReportCommonPath + GeLocCommon.RightsReport;
            path = Server.MapPath(path + GeLocCommon.M02_details);
            if (System.IO.File.Exists(path))
            {
                localReport.ReportPath = path;
            }
            else
            {
                return RedirectToAction("Index");
            }

            var data = GetTable(1);
            reportDataSource.Add(new ReportDataSource
            {
                Name = GeLocCommon.RightsDetailDataSet,
                Value = data
            });


            localReport = localReport.LocalizeReport();
            var totalWidth = (float)7.215;
            totalWidth = totalWidth / data.Columns.Count;
            var resizedcolumns = "< TablixColumns >";
            for (int i = 0; i < data.Columns.Count; i++)
            {
                resizedcolumns = resizedcolumns + "<  TablixColumn > < Width>" + totalWidth + "in</ Width>< /TablixColumn  >";
            }

            for (int i = data.Columns.Count; i < 5; i++)
            {
                resizedcolumns = resizedcolumns + "< TablixColumn ><  Width >0.1in</  Width  ><  /TablixColumn  >";
            }

            resizedcolumns = resizedcolumns + "<  /TablixColumns  >";
            resizedcolumns = resizedcolumns.ToString().Replace(",", ".");
            var rptxml = System.IO.File.ReadAllText(path);
            var start = rptxml.IndexOf("< TablixColumns >");
            var end = rptxml.IndexOf("< /TablixColumns  >") + " < /  TablixColumns  >".Length;
            rptxml = rptxml.Substring(0, start) + resizedcolumns + rptxml.Substring(end);
            System.IO.TextReader tr = new System.IO.StringReader(rptxml);
            localReport.LoadReportDefinition(tr);
            tr.Close();
            var downloadedFileName = GeLocCommon.RightsReportTemplate + 1 + GeLocCommon.SeperatorDash + DateTime.Now.ToString(GeLocCommon.ReportGeneratedDateFormat) + GeLocCommon.SeperatorDot + "pdf";
            string mimeType;
            return File(localReport.GenerateReport(ExportDataType.Pdf.ToString(), reportDataSource, null, out mimeType, false), mimeType, downloadedFileName);
        }



 

Export to excel using jquery for JQgrid

step 1 :create  ExportGridToExcel.ashx for open file

 public class ExportGridToExcel : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            string tabData = context.Request["excelData"];

            DataTable dt = ConvertCsvData(tabData);
            if (dt == null)
            {
                return;
            }
            string excelFilename = context.Request["filename"];
            if (File.Exists(excelFilename))
                File.Delete(excelFilename);

            string FileName = CreateExcel.CreateExcelDocument(dt, excelFilename, context.Response); ;
            string FilePath = "ExcelFiles//" + FileName;
           

           
            context.Response.Clear();
            context.Response.Buffer = true;

            context.Response.AddHeader("content-disposition", string.Format("attechment; filename={0}", FileName));
            string strFilePath = context.Request.PhysicalApplicationPath + FilePath;
            string strExtension = System.IO.Path.GetExtension(strFilePath);
            if (strExtension.Equals(".xls", StringComparison.InvariantCulture) || strExtension.Equals(".csv", StringComparison.InvariantCulture) || strExtension.Equals(".xlsx", StringComparison.InvariantCulture))
            {
                context.Response.ContentType = "application/ms-excel";
            }
            else if (strExtension.Equals(".pdf", StringComparison.InvariantCulture))
            {
                context.Response.ContentType = "application/pdf";
            }

            context.Response.WriteFile(strFilePath);
            context.Response.End();

        }

        private DataTable ConvertCsvData(string CSVdata)
        {
            //  Convert a tab-separated set of data into a DataTable, ready for our C# CreateExcelFile libraries
            //  to turn into an Excel file.
            //
            DataTable dt = new DataTable();
            try
            {
                System.Diagnostics.Trace.WriteLine(CSVdata);

                string[] Lines = CSVdata.Split(new char[] { '\r', '\n' });
                if (Lines == null)
                    return dt;
                if (Lines.GetLength(0) == 0)
                    return dt;

                string[] HeaderText = Lines[0].Split('\t');

                int numOfColumns = HeaderText.Count();


                foreach (string header in HeaderText)
                    dt.Columns.Add(header, typeof(string));

                DataRow Row;
                for (int i = 1; i < Lines.GetLength(0); i++)
                {
                    string[] Fields = Lines[i].Split('\t');
                    if (Fields.GetLength(0) == numOfColumns)
                    {
                        Row = dt.NewRow();
                        for (int f = 0; f < numOfColumns; f++)
                        {
                            if (Fields[f] == "0")
                                Row[f] = "";
                            else
                                Row[f] = Fields[f].Replace("null", "");

                            Row[f] = Row[f].ToString().Replace("", "");
                            Row[f] = Row[f].ToString().Replace("
", ",");
                        }
                        dt.Rows.Add(Row);
                    }
                }

                return dt;
            }
            catch (Exception ex)
            {
                System.Diagnostics.Trace.WriteLine("An exception occurred: " + ex.Message);
                return null;
            }
        }
   
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }

   public class CreateExcel
    {
        ///

        /// Create an Excel file, and write it out to a MemoryStream (rather than directly to a file)
        ///

        /// DataTable containing the data to be written to the Excel.
        /// The filename (without a path) to call the new Excel file.
        /// HttpResponse of the current page.
        /// True if it was created succesfully, otherwise false.
        public static string  CreateExcelDocument(DataTable dt, string filename, System.Web.HttpResponse Response)
        {
            try
            {

               return CreateExcelDocumentAsStream(dt, filename, Response);
               
            }
            catch (Exception ex)
            {

                return "";
            }
        }


        ///

        /// Create an Excel file, and write it out to a MemoryStream (rather than directly to a file)
        ///

        /// DataSet containing the data to be written to the Excel.
        /// The filename (without a path) to call the new Excel file.
        /// HttpResponse of the current page.
        /// Either a MemoryStream, or NULL if something goes wrong.
        public static string  CreateExcelDocumentAsStream(DataTable dt, string filename, System.Web.HttpResponse Response)
        {
            try
            {
                Random rnd = new Random();
                string _strFile = DateTime.Now.ToString("ddMMyyyy") + "_" + rnd.Next(0, 9999) + ".xlsx";
                FileInfo newFile = new FileInfo(HttpContext.Current.Server.MapPath("~/ExcelFiles/" + _strFile));
                if (newFile.Exists)
                {
                    newFile.Delete();  // ensures we create a new workbook
                    newFile = new FileInfo(_strFile);
                }

                ExcelPackage xlPackage = new ExcelPackage(newFile);
                ExcelWorksheet xlWorkSheet = xlPackage.Workbook.Worksheets.Add("DefaultFormat");
                int _RowID = 1;
                xlWorkSheet.Cells.Style.Numberformat.Format = "@";
                xlWorkSheet.Cells.Style.Numberformat.Format = "General";
                int _Cell = 1;
                for (int i = 1; i <= dt.Columns.Count; i++)
                {
                    xlWorkSheet.Cells[_RowID, _Cell].Value = dt.Columns[i - 1].ToString();
                    xlWorkSheet.Cells[_RowID, _Cell].Style.WrapText = true;
                    xlWorkSheet.Cells[_RowID, _Cell].Style.Font.Bold = true;
                    xlWorkSheet.Cells[_RowID, _Cell].Style.Border.Top.Style = ExcelBorderStyle.Thin;
                    xlWorkSheet.Cells[_RowID, _Cell].Style.Border.Left.Style = ExcelBorderStyle.Thin;
                    xlWorkSheet.Cells[_RowID, _Cell].Style.Border.Right.Style = ExcelBorderStyle.Thin;
                    xlWorkSheet.Cells[_RowID, _Cell].Style.Border.Bottom.Style = ExcelBorderStyle.Thin;
                    xlWorkSheet.Cells[_RowID, _Cell].Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;
                    xlWorkSheet.Cells[_RowID, _Cell].Style.VerticalAlignment = ExcelVerticalAlignment.Center;
                    xlWorkSheet.Cells[_RowID, _Cell].Style.Numberformat.Format = "@";
                    xlWorkSheet.Cells[_RowID, _Cell].Style.Numberformat.Format = "General";
                    _Cell++;

                }
                _RowID++;
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                     _Cell = 1;
                    for (int ji = 0; ji < dt.Columns.Count; ji++)
                    {
                        xlWorkSheet.Cells[_RowID, _Cell].Value = Convert.ToString(dt.Rows[i][ji]);
                        xlWorkSheet.Cells[_RowID, _Cell].Style.Border.Top.Style = ExcelBorderStyle.Thin;
                        xlWorkSheet.Cells[_RowID, _Cell].Style.Border.Left.Style = ExcelBorderStyle.Thin;
                        xlWorkSheet.Cells[_RowID, _Cell].Style.Border.Right.Style = ExcelBorderStyle.Thin;
                        xlWorkSheet.Cells[_RowID, _Cell].Style.Border.Bottom.Style = ExcelBorderStyle.Thin;
                        xlWorkSheet.Cells[_RowID, _Cell].Style.HorizontalAlignment = ExcelHorizontalAlignment.Left;
                        xlWorkSheet.Cells[_RowID, _Cell].Style.VerticalAlignment = ExcelVerticalAlignment.Center;
                        xlWorkSheet.Cells[_RowID, _Cell].Style.Numberformat.Format = "@";
                        xlWorkSheet.Cells[_RowID, _Cell].Style.Numberformat.Format = "General";
                        _Cell++;
                    }
                    _RowID++;
                }
                xlWorkSheet.Cells.AutoFitColumns();
                xlPackage.Save();
                xlPackage.Dispose();
                return _strFile;
            }
            catch (Exception ex)
            {

                return "";
            }
        }

    }


Step 2 Js file

function ExportJQGridDataToExcel(tableCtrl, excelFilename) {
    //  Export the data from our jqGrid into a (real !) Excel .xlsx file.
    //
    //  We'll build up a (very large?) tab-separated string containing the data to be exported, then POST them
    //  off to a .ashx handler, which creates the Excel file.
    debugger
    var allJQGridData = $(tableCtrl).jqGrid('getGridParam', 'data');

    var jqgridRowIDs = $(tableCtrl).getDataIDs();                // Fetch the RowIDs for this grid
    var headerData = $(tableCtrl).getRowData(jqgridRowIDs[0]);   // Fetch the list of "name" values in our colModel

    //  For each visible column in our jqGrid, fetch it's Name, and it's Header-Text value
    var columnNames = new Array();       //  The "name" values from our jqGrid colModel
    var columnHeaders = new Array();     //  The Header-Text, from the jqGrid "colNames" section
    var inx = 0;
    var allColumnNames = $(tableCtrl).jqGrid('getGridParam', 'colNames');

    for (var headerValue in headerData) {
        //  If this column ISN'T hidden, and DOES have a column-name, then we'll export its data to Excel.
        var isColumnHidden = $(tableCtrl).jqGrid("getColProp", headerValue).hidden;
        if (!isColumnHidden && headerValue != null) {
            columnNames.push(headerValue);
            columnHeaders.push(allColumnNames[inx]);
        }
        inx++;
    }

    //  We now need to build up a (potentially very long) tab-separated string containing all of the data (and a header row)
    //  which we'll want to export to Excel.

    //  First, let's append the header row...
    var excelData = '';
    for (var k = 0; k < columnNames.length; k++) {
        excelData += columnHeaders[k] + "\t";
    }
    excelData = removeLastChar(excelData) + "\r\n";

    //  ..then each row of data to be exported.
    var cellValue = '';
    for (i = 0; i < allJQGridData.length; i++) {

        var data = allJQGridData[i];

        for (var j = 0; j < columnNames.length; j++) {

            // Fetch one jqGrid cell's data, but make sure it's a string
            cellValue = '' + data[columnNames[j]];

            if (cellValue == null)
                excelData += "\t";
            else {
                if (cellValue.indexOf("a href") > -1) {
                    //  Some of my cells have a jqGrid cell with a formatter in them, making them hyperlinks.
                    //  We don't want to export the " " tags to our Excel file, just the cell's text.
                    cellValue = $(cellValue).text();
                }
                //  Make sure we are able to POST data containing apostrophes in it
                cellValue = cellValue.replace(/'/g, "'");

                excelData += cellValue + "\t";
            }
        }
        excelData = removeLastChar(excelData) + "\r\n";
    }
    //  Now, we need to POST our Excel Data to our .ashx file *and* redirect to the .ashx file.
    postAndRedirect("../../Handlers/ExportGridToExcel.ashx?filename=" + excelFilename, { excelData: excelData });
}

function removeLastChar(str) {
    //  Remove the last character from a string
    return str.substring(0, str.length - 1);
}

function postAndRedirect(url, postData) {
    //  Redirect to a URL, and POST some data to it.
    //  Taken from:
    //  http://stackoverflow.com/questions/8389646/send-post-data-on-redirect-with-javascript-jquery
    //
    var postFormStr = "

\n";

    for (var key in postData) {
        if (postData.hasOwnProperty(key)) {
            postFormStr += "";
        }
    }

    postFormStr += "

";

    var formElement = $(postFormStr);

    $('body').append(formElement);
    $(formElement).submit();
}


step 3  Add js code in jqgriid


   $("#jqTable").navButtonAdd('#jqTablePager', {
        title: "Export to Excel",
        buttonicon: "ace-icon fa fa-file-excel-o",
        caption: "",
        onClickButton: function () {
            ExportJQGridDataToExcel("#jqTable", "ExcelName.xlsx");
        },
        position: "last"
    });
if data not display in excel please set below property in JqGrid
loadonce: true,


Thanks

Upload document using Ajax call

 submitHandler: function (form) {
                var $form = $("#frmQuestion"), formData = new FormData(), params = $form.serializeArray();
                $.each(params, function (i, val) {
                    formData.append(val.name, val.value);
                });

                var files = $("input[Type='file']");
                for (var i = 0; i < files.length; i++) {
                    formData.append(files[i].name, $('#' + files[i].id).get(0).files[0]);
                             }

               
                $.ajax({
                    url: '/Questions/SaveQuestion',
                    data: formData,
                    cache: false,
                    contentType: false,
                    processData: false,
                    type: 'POST',
                    mimeType: "multipart/form-data",
                    beforeSend: function () { ShowCustomLoading(true); },
                    complete: function () { ShowCustomLoading(false); },
                    success: function (datas) {

                        var data = JSON.parse(datas)
                        if (data.Key == true) {
                            new PNotify({
                                text: data.Value,
                                delay: 1500,
                                type: 'success'
                            });
                            $("#divlist").show();
                            $("#divAdd").hide();
                            $("#jqTable").trigger('reloadGrid');
                        }
                        else {
                            new PNotify({
                                text: data.Value,
                                delay: 1500,
                                type: 'error'
                            });
                        }
                    }
                });
            }

Exporting to Word, Excel ,pdf and CSV

In this article, I will explain how to export GridView to Word, Excel, PDF and CSV formats.

Exporting to Word, Excel and CSV can be easily achieved using ASP.Net without any third party tools, but for exporting GridView to PDF I am using iTextSharp which is a free library for exporting html to PDF.

To start with I have a GridView in which I am showing Customers records from the NorthWind Database.

The HTML markup of the GridView is as shown below

<asp:GridView ID="GridView1" runat="server"

    AutoGenerateColumns = "false" Font-Names = "Arial"

    Font-Size = "11pt" AlternatingRowStyle-BackColor = "#C2D69B" 

    HeaderStyle-BackColor = "green" AllowPaging ="true"  

    OnPageIndexChanging = "OnPaging" >

   <Columns>

    <asp:BoundField ItemStyle-Width = "150px" DataField = "CustomerID"

    HeaderText = "CustomerID" />

    <asp:BoundField ItemStyle-Width = "150px" DataField = "City"

    HeaderText = "City"/>

    <asp:BoundField ItemStyle-Width = "150px" DataField = "Country"

    HeaderText = "Country"/>

    <asp:BoundField ItemStyle-Width = "150px" DataField = "PostalCode"

    HeaderText = "PostalCode"/>

   Columns>

asp:GridView>

In the figure below the GridView is shown with four buttons

1.     Export To Word

2.     Export To Excel

3.     Export To PDF

4.     Export To CSV

Export to Microsoft Word Format

C#

protected void btnExportWord_Click(object sender, EventArgs e)

{

    Response.Clear();

    Response.Buffer = true;

    Response.AddHeader("content-disposition",

    "attachment;filename=GridViewExport.doc");

    Response.Charset = "";

    Response.ContentType = "application/vnd.ms-word ";

    StringWriter sw= new StringWriter();

    HtmlTextWriter hw = new HtmlTextWriter(sw);

    GridView1.AllowPaging = false;

    GridView1.DataBind();

    GridView1.RenderControl(hw);

    Response.Output.Write(sw.ToString());

    Response.Flush();

    Response.End();

}

VB.Net

Protected Sub btnExportWord_Click(ByVal sender As Object,

    ByVal e As EventArgs)

        Response.Clear()

        Response.Buffer = True

        Response.AddHeader("content-disposition",

        "attachment;filename=GridViewExport.doc")

        Response.Charset = ""

        Response.ContentType = "application/vnd.ms-word "

        Dim sw As New StringWriter()

        Dim hw As New HtmlTextWriter(sw)

        GridView1.AllowPaging = False

        GridView1.DataBind()

        GridView1.RenderControl(hw)

        Response.Output.Write(sw.ToString())

        Response.Flush()

        Response.End()

    End Sub

The above function renders the GridView contents as Microsoft Word format. You will notice I have disabled paging before exporting, so that all the pages are exported.

The Output Exported File

Export to Microsoft Excel Format

For exporting the document to Excel if you do it directly as done in case of word the row background color is applied throughout to all the columns in the Excel Sheet hence in order to avoid it. I have done a workaround below.

First I am changing the background color of each row back to white.

Then I am applying the background color to each individual cell rather than the whole row. Thus when you export now you will notice that the formatting is applied only to the GridView cells and not all

Also I am applying textmode style class to all cells and then adding the style CSS class to the GridView before rendering it, this ensures that all the contents of GridView are rendered as text.

protected void btnExportExcel_Click(object sender, EventArgs e)

{

Response.Clear();

Response.Buffer = true;

Response.AddHeader("content-disposition",

"attachment;filename=GridViewExport.xls");

Response.Charset = "";

Response.ContentType = "application/vnd.ms-excel";

StringWriter sw = new StringWriter();

HtmlTextWriter hw = new HtmlTextWriter(sw);

GridView1.AllowPaging = false;

GridView1.DataBind();

//Change the Header Row back to white color

GridView1.HeaderRow.Style.Add("background-color", "#FFFFFF");

//Apply style to Individual Cells

GridView1.HeaderRow.Cells[0].Style.Add("background-color", "green");

GridView1.HeaderRow.Cells[1].Style.Add("background-color", "green");

GridView1.HeaderRow.Cells[2].Style.Add("background-color", "green");

GridView1.HeaderRow.Cells[3].Style.Add("background-color", "green");  

for (int i = 0; i < GridView1.Rows.Count;i++ )

{

    GridViewRow row = GridView1.Rows[i];

    //Change Color back to white

    row.BackColor = System.Drawing.Color.White;

    //Apply text style to each Row

    row.Attributes.Add("class", "textmode");

    //Apply style to Individual Cells of Alternating Row

    if (i % 2 != 0)

    {

        row.Cells[0].Style.Add("background-color", "#C2D69B");

        row.Cells[1].Style.Add("background-color", "#C2D69B");

        row.Cells[2].Style.Add("background-color", "#C2D69B");

        row.Cells[3].Style.Add("background-color", "#C2D69B");  

    }

}

GridView1.RenderControl(hw);

//style to format numbers to string

string style = @"";

Response.Write(style);

Response.Output.Write(sw.ToString());

Response.Flush();

Response.End();

}

VB.Net

Protected Sub btnExportExcel_Click(ByVal sender As Object,

ByVal e As EventArgs)

  Response.Clear()

  Response.Buffer = True

  Response.AddHeader("content-disposition",

  "attachment;filename=GridViewExport.xls")

  Response.Charset = ""

  Response.ContentType = "application/vnd.ms-excel"

 

  Dim sw As New StringWriter()

  Dim hw As New HtmlTextWriter(sw)

  GridView1.AllowPaging = False

  GridView1.DataBind()

  'Change the Header Row back to white color

  GridView1.HeaderRow.Style.Add("background-color", "#FFFFFF")

  'Apply style to Individual Cells

  GridView1.HeaderRow.Cells(0).Style.Add("background-color", "green")

  GridView1.HeaderRow.Cells(1).Style.Add("background-color", "green")

  GridView1.HeaderRow.Cells(2).Style.Add("background-color", "green")

  GridView1.HeaderRow.Cells(3).Style.Add("background-color", "green")

  For i As Integer = 0 To GridView1.Rows.Count - 1

   Dim row As GridViewRow = GridView1.Rows(i)

   'Change Color back to white

   row.BackColor = System.Drawing.Color.White

   'Apply text style to each Row

   row.Attributes.Add("class", "textmode")

   'Apply style to Individual Cells of Alternating Row

   If i Mod 2 <> 0 Then

    row.Cells(0).Style.Add("background-color", "#C2D69B")

    row.Cells(1).Style.Add("background-color", "#C2D69B")

    row.Cells(2).Style.Add("background-color", "#C2D69B")

    row.Cells(3).Style.Add("background-color", "#C2D69B")

   End If

  Next

  GridView1.RenderControl(hw)

  'style to format numbers to string

  Dim style As String = ""

  Response.Write(style)

  Response.Output.Write(sw.ToString())

  Response.Flush()

  Response.End()

End Sub

The Output Exported File

Export to Portable Document Format

For exporting the GridView to PDF I am using the iTextSharp Library. You will need to Add Reference for the iTextSharp Library in your Website.

Then import the following Namespaces

C#

using iTextSharp.text;

using iTextSharp.text.pdf;

using iTextSharp.text.html;

using iTextSharp.text.html.simpleparser;

VB.Net

Imports iTextSharp.text

Imports iTextSharp.text.pdf

Imports iTextSharp.text.html

Imports iTextSharp.text.html.simpleparser

By default the iTextSharp Library does not support background color of table cells or table rows

Hence when you render it as PDF your GridView is rendered without any formatting.

Recently I read an article on hamang.net where the author has provided the snippet to modify the iTextSharp so that it exports the HTML with background color.

For this tutorial, I have already modified the iTextSharp Library DLL so that the GridView is rendered with all the background color used. You can refer the code for exporting GridView to PDF below

              

C#

protected void btnExportPDF_Click(object sender, EventArgs e)

{

    Response.ContentType = "application/pdf";

    Response.AddHeader("content-disposition",

     "attachment;filename=GridViewExport.pdf");

    Response.Cache.SetCacheability(HttpCacheability.NoCache);

    StringWriter sw = new StringWriter();

    HtmlTextWriter hw = new HtmlTextWriter(sw);

    GridView1.AllowPaging = false;

    GridView1.DataBind();

    GridView1.RenderControl(hw);

    StringReader sr = new StringReader(sw.ToString());

    Document pdfDoc = new Document(PageSize.A4, 10f,10f,10f,0f);

    HTMLWorker htmlparser = new HTMLWorker(pdfDoc);

    PdfWriter.GetInstance(pdfDoc, Response.OutputStream);

    pdfDoc.Open();

    htmlparser.Parse(sr);

    pdfDoc.Close();

    Response.Write(pdfDoc);

    Response.End(); 

}

VB.Net

Protected Sub btnExportPDF_Click(ByVal sender As Object,

ByVal e As EventArgs)

 Response.ContentType = "application/pdf"

 Response.AddHeader("content-disposition",

 "attachment;filename=GridViewExport.pdf")

 Response.Cache.SetCacheability(HttpCacheability.NoCache)

 Dim sw As New StringWriter()

 Dim hw As New HtmlTextWriter(sw)

 GridView1.AllowPaging = False

 GridView1.DataBind()

 GridView1.RenderControl(hw)

 Dim sr As New StringReader(sw.ToString())

 Dim pdfDoc As New Document(PageSize.A4, 10.0F, 10.0F, 10.0F, 0.0F)

 Dim htmlparser As New HTMLWorker(pdfDoc)

 PdfWriter.GetInstance(pdfDoc, Response.OutputStream)

 pdfDoc.Open()

 htmlparser.Parse(sr)

 pdfDoc.Close()

 Response.Write(pdfDoc)

 Response.End()

End Sub

The Output Exported File

Export to Text/CSV

Finally comes exporting GridView to CSV or Text File delimited by a separator like comma.

To export the GridView as CSV, I am running a two for loops. While looping through the GridView columns and appending comma after each column and while looping through rows appending new line character. Refer the code below.

C#

protected void btnExportCSV_Click(object sender, EventArgs e)

{

    Response.Clear();

    Response.Buffer = true;

    Response.AddHeader("content-disposition",

     "attachment;filename=GridViewExport.csv");

    Response.Charset = "";

    Response.ContentType = "application/text";

    GridView1.AllowPaging = false;

    GridView1.DataBind();

    StringBuilder sb = new StringBuilder();

    for (int k = 0; k < GridView1.Columns.Count; k++)

    {

        //add separator

        sb.Append(GridView1.Columns[k].HeaderText + ',');

    }

    //append new line

    sb.Append("\r\n");

    for (int i = 0; i < GridView1.Rows.Count; i++)

    {

        for (int k = 0; k < GridView1.Columns.Count; k++)

        {

            //add separator

            sb.Append(GridView1.Rows[i].Cells[k].Text + ',');

        }

        //append new line

        sb.Append("\r\n");

    }

    Response.Output.Write(sb.ToString());

    Response.Flush();

    Response.End();

}

      

VB.Net

Protected Sub btnExportCSV_Click(ByVal sender As Object,

ByVal e As EventArgs)

 Response.Clear()

 Response.Buffer = True

 Response.AddHeader("content-disposition",

 "attachment;filename=GridViewExport.csv")

 Response.Charset = ""

 Response.ContentType = "application/text"

 GridView1.AllowPaging = False

 GridView1.DataBind()

 Dim sb As New StringBuilder()

 For k As Integer = 0 To GridView1.Columns.Count - 1

  'add separator

  sb.Append(GridView1.Columns(k).HeaderText + ","c)

 Next

 'append new line

 sb.Append(vbCr & vbLf)

 For i As Integer = 0 To GridView1.Rows.Count - 1

  For k As Integer = 0 To GridView1.Columns.Count - 1

   'add separator

   sb.Append(GridView1.Rows(i).Cells(k).Text + ","c)

  Next

  'append new line

  sb.Append(vbCr & vbLf)

 Next

 Response.Output.Write(sb.ToString())

 Response.Flush()

 Response.End()

End Sub

The Output Exported File

When you run the application first time and click export you might receive the following error

To avoid the error you will need to add this event which ensures that the GridView is Rendered before exporting.

  

C#

public override void VerifyRenderingInServerForm(Control control)

{

    /* Verifies that the control is rendered */

}

VB.Net

Public Overloads Overrides Sub VerifyRenderingInServerForm

(ByVal control As Control)

    ' Verifies that the control is rendered

End Sub