Don’t Export Persian fields finely from ASP.NET to Excel (VS2010 – C#)

HttpContext.Current.Response.Clear();
HttpContext.Current.Response.AddHeader("content-disposition",
string.Format("attachment;filename={0}.xls", "Exported"));
HttpContext.Current.Response.Charset = "";
HttpContext.Current.Response.ContentType = "application/ms-excel";

using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw))
{
//  Create a table to contain the grid
Table table = new Table();

foreach (GridViewRow row in GridView1.Rows)
{
table.Rows.Add(row);
}

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

//  render the htmlwriter into the response
HttpContext.Current.Response.Write(sw.ToString());
HttpContext.Current.Response.End();
}
}