while Huge data exporting into Excel getting White Pages in browser

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.NET

C#3.5

SQL-Server-2012

Hi All,

I am Exporting Huge data into excel ,getting white pages in browser, can u guide me or send snippets




protected void Button1_Click(object sender, EventArgs e)
{

ExportToExcel((DataTable)ViewState["gvMobile"]);
}
public void ExportToExcel(DataTable dt)
{
if (dt.Rows.Count > 0)
{
string filename = "DownloadMobileNoExcel.xls";
System.IO.StringWriter tw = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
DataGrid dgGrid = new DataGrid();
dgGrid.DataSource = dt;
dgGrid.DataBind();

//Get the HTML for the control.
dgGrid.RenderControl(hw);
//Write the HTML back to the browser.
//Response.ContentType = application/vnd.ms-excel;
Response.ContentType = "application/vnd.ms-excel";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + filename + "");
this.EnableViewState = false;
Response.Write(tw.ToString());
Response.End();
}
}
private static DataTable SampleData()
{
//SqlConnection con = new SqlConnection("Data Source=GSPSDELL201;Initial Catalog=Test;User ID=sa;Password=sa");
//con.Open();
DataTable sampleDataTable = new DataTable();

sampleDataTable.Columns.Add("FirstColumn", typeof(string));
sampleDataTable.Columns.Add("SecondColumn", typeof(string));
DataRow sampleDataRow;
for (int i = 1; i <=200000; i++)
{

sampleDataRow = sampleDataTable.NewRow();
sampleDataRow["FirstColumn"] = "Cell1: " + i.ToString(CultureInfo.CurrentCulture);
sampleDataRow["SecondColumn"] = "Cell2: " + i.ToString(CultureInfo.CurrentCulture);
sampleDataTable.Rows.Add(sampleDataRow);
}

return sampleDataTable;
}