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Exporting Gridview to .xls but excel file is not generating

I have written the below code to generate the excel file.
private void ExportReport(IList ApproveListData, string fileName)
{
var gv = new GridView();
gv.AllowPaging = false;
gv.DataSource = ApproveListData;
gv.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment; filename=" + fileName);
Response.ContentType = "application/ms-excel";
Response.Charset = "";
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
gv.RenderControl(htw);
Response.Output.Write("<b> Pending approval report </b>");
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
}
I have checked data in the grid view but excel file is not generating.
Please help.
Thanks in advance.

ASP.NET Gridview to excel

I have a page with Gridview and when button clicked I should export data from Gridview to .xls file. I have tried it in many ways. This is my code:
protected void export_Click(object sender, EventArgs e)
{
Response.ClearContent();
//Response.Buffer = true;
//Response.ClearHeaders();
//Response.CacheControl = "no-cache";
//Response.AddHeader("Pragma", "no-cache");
Response.AddHeader("Content-Disposion","attachment; filename=Clients.xls");
Response.ContentType = "application/excel";
StringWriter swriter = new StringWriter();
HtmlTextWriter hwriter = new HtmlTextWriter(swriter);
grid.RenderControl(hwriter);
Response.Write(swriter.ToString());
Response.End();
}
The problem is when I click the button it is exporting aspx file. I have tried all answers in Stackoverflow and from other sources as well. However, I am not being able to correct it. I need exact reason why it is so and some possible solutions.(I tried Content-type as "application/excel", "application/vn", "application/vn-excel" as well.)

You can just follow following code, it is working fine..
protected void cmdExport_Click(object sender, EventArgs e)
{
Response.Clear();
Response.AddHeader("content-disposition", "attachment; filename=SupplierList.xls");
Response.ContentType = "application/vnd.xls";
System.IO.StringWriter WriteItem = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htmlText = new HtmlTextWriter(WriteItem);
GridView1.AllowPaging = false;
DataTable dtSupplier = (DataTable)ViewState["dtSupplier"];
GridView1.DataSource = dtSupplier;
GridView1.DataBind();
GridView1.RenderControl(htmlText);
Response.Write(WriteItem.ToString());
Response.End();
}
Hope this will help you.
thanks

How to display gridLines in GridView from code behind

In aspx code i set GridLines="None"
How can i show GridLines from code behind when exporting grid-view to excel file.
protected void btnexcel_Click(object sender, EventArgs e)
{
Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition",
"attachment;filename=UsersReport.xls");
Response.Charset = "";
Response.ContentType = "application/vnd.ms-excel";
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
gridusers.DataBind();
gridusers.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();
}

In function start, set:
grdAdslCompanyAdvisers.GridLines = GridLines.Both;
after export again
grdAdslCompanyAdvisers.GridLines = GridLines.None;
Hope this helps or gives you an idea.

Export gridview to excel, and replace one column

I need to export gridview data to excel on button click.
But in gridview one column data need to be changed with data that is another table from database.
For example:
Gridview showing employee ID(empid) from one table but I need to show username in place of empid in excel data.
The export to Excel:
protected void btmexport_Click(object sender, EventArgs e)
{
string attachment = "attachment; filename=Export.xls";
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.ContentType = "application/ms-excel";
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
HtmlForm frm = new HtmlForm();
grd_data.Parent.Controls.Add(frm);
frm.Attributes["runat"] = "server";
frm.Controls.Add(grd_data);frm.RenderControl(htw);
Response.Write(sw.ToString());
Response.End();
}

could not generate excel file on button click in c#

In my project when i click on a button it should generate excel file and in the middle of first line in excel file as a heading i should get as "my first excel file". I could not get it when i am trying with following code.Any ideas?. Thanks in advance
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
namespace listofdirectories
{
public partial class ExportToExcel : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
HttpResponse response = HttpContext.Current.Response;
response.ContentType = "application/ms-excel";
response.AddHeader("Content-Disposition", "attachment;filename=practise.xls");
StreamWriter stw = new StreamWriter();
HtmlTextWriter htw = new HtmlTextWriter(stw);
stw.WriteLine("my first excel file");
response.End();
}
}
}

You forgot to add the content to the response like this-
response.Write(stw.ToString());
response.End();
Also change your content type to this -
response.ContentType = "application/vnd.ms-excel";
Instead of using StreamWriter use StringWriter and change your code like this-
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.Charset = "";
string FileName = "filename.xls";
StringWriter strwritter = new StringWriter();
HtmlTextWriter htmltextwrtter = new HtmlTextWriter(strwritter);
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ContentType ="application/vnd.ms-excel";
Response.AddHeader("Content-Disposition","attachment;filename=" + FileName);
Response.Write(strwritter.ToString());
Response.End();
To load the content in to the excel file, if recommend that you load the dataset with the data, then bind a grid view with that dataset and render the gridview as html after that fill the response with that rendered html like this-
GridView gv = new GridView();
gv.DataSource = dataset; //Your datasource from database
gv.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment; filename=filename.xls");
Response.ContentType = "application/vnd.ms-excel";
Response.Charset = "";
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
gv.RenderControl(htw);
Response.Write(sw.ToString());
Response.Flush();
Response.End();