Convert Datatable or Export Datatable to Excel file

private void ExporttoExcel(DataTable table)
{
    HttpContext.Current.Response.Clear();
    HttpContext.Current.Response.ClearContent();
    HttpContext.Current.Response.ClearHeaders();
    HttpContext.Current.Response.Buffer = true;
    HttpContext.Current.Response.ContentType = "application/ms-excel";
    HttpContext.Current.Response.Write(@""-//W3C//DTD HTML 4.0 Transitional//EN"">");
    HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=Reports.xls");
   
    HttpContext.Current.Response.Charset = "utf-8";
    HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("windows-1250");
      //sets font
    HttpContext.Current.Response.Write("");
    HttpContext.Current.Response.Write("


");
    //sets the table border, cell spacing, border color, font of the text, background, foreground, font height
    HttpContext.Current.Response.Write(" + 
      "borderColor='#000000' cellSpacing='0' cellPadding='0' " + 
      "style='font-size:10.0pt; font-family:Calibri; background:white;'>
");
    //am getting my grid's column headers
int columnscount = GridView_Result.Columns.Count;

    for (int j = 0; j < columnscount; j++)
    {      //write in new column
        HttpContext.Current.Response.Write(");
        //Get column headers  and make it as bold in excel columns
        HttpContext.Current.Response.Write("");
        HttpContext.Current.Response.Write(GridView_Result.Columns[j].HeaderText.ToString());
        HttpContext.Current.Response.Write("

    
"

"); HttpContext.Current.Response.Write(""); } HttpContext.Current.Response.Write(""); foreach (DataRow row in table.Rows) {//write in new row HttpContext.Current.Response.Write(" " ); for (int i = 0; i < table.Columns.Count; i++) { HttpContext.Current.Response.Write(""); HttpContext.Current.Response.Write(row[i].ToString()); HttpContext.Current.Response.Write(""); } HttpContext.Current.Response.Write(""); } HttpContext.Current.Response.Write(""); HttpContext.Current.Response.Write(""); HttpContext.Current.Response.Flush(); HttpContext.Current.Response.End(); }