Comments by Rickin Kane (Top 67 by date)

my friend , in different class , u are calling
int conlen = FileUpload1.PostedFile.ContentLength; --[NullREFERENCEException unhandled by user code]
do u think that class even know that control exists

public static void ExportToFolder(string fileName, GridView gv)
{
System.Text.StringBuilder sb = new System.Text.StringBuilder();
using (StringWriter sw = new StringWriter(sb))
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw))
{
// Create a form to contain the grid
Table table = new Table();


// add the header row to the table
if (gv.HeaderRow != null)
{
GridViewExportUtil.PrepareControlForExport(gv.HeaderRow);
table.Rows.Add(gv.HeaderRow);
}


// add each of the data rows to the table
foreach (GridViewRow row in gv.Rows)
{
GridViewExportUtil.PrepareControlForExport(row);
table.Rows.Add(row);
}


// add the footer row to the table
if (gv.FooterRow != null)
{
GridViewExportUtil.PrepareControlForExport(gv.FooterRow);
table.Rows.Add(gv.FooterRow);
}


// render the table into the htmlwriter
table.RenderControl(htw);


//Create file
System.IO.TextWriter w = new System.IO.StreamWriter(HttpContext.Current.Server.MapPath("~") + "\\" + fileName);
w.Write(sb.ToString());
w.Flush();
w.Close();


}
}
}

Reference :http://forums.asp.net/t/1542176.aspx