Convert GridView To Excel File (.xls) in C#

 Just want to share my code for converting GridView to Excel file using C#

I use iTextSharp and here's my code:


using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.html.simpleparser;


protected void ConvertToExcel_Click(object sender, System.EventArgs e)   
{
    Response.ContentType = "application/vnd.ms-excel";
    Response.AddHeader("content-disposition",     "attachment;filename=ContactMailingAddress.xls");
    Response.Charset = "";
    StringWriter sw = new StringWriter();
    HtmlTextWriter hw = new HtmlTextWriter(sw);
    ContactMailingView.AllowPaging = false;
    ContactMailingView.DataBind();
           
   
        //Apply style to Individual Cells
   
        ContactMailingView.HeaderRow.Cells(0).Style.Add("background-color", "yellow");
    ContactMailingView.HeaderRow.Cells(1).Style.Add("background-color", "yellow");
    ContactMailingView.HeaderRow.Cells(2).Style.Add("background-color", "yellow");
    ContactMailingView.HeaderRow.Cells(3).Style.Add("background-color", "yellow");
    ContactMailingView.HeaderRow.Cells(4).Style.Add("background-color", "yellow");
   

    for (int i = 0; i <= ContactMailingView.Rows.Count - 1; i++) {
        GridViewRow row = ContactMailingView.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");
            row.Cells(4).Style.Add("background-color", "#C2D69B");           
        }
    }
   
         ContactMailingView.RenderControl(hw);
   
        //style to format numbers to string
    string style = "<style>.textmode{mso-number-format:\\@;}</style>";
    Response.Write(style);
    Response.Output.Write(sw.ToString());
    Response.Flush();
    Response.End();
}