FileUpload Control getting null in [Ajax.AjaxMethod]

[DineshSharmain]

Hi Frends I am using the ASP.Net FileUpload control to upload the file and using AjaxMethod to save the file on Server but I am getting the FileUpload as null...... anybody pls help....

[Ajax.AjaxMethod()]
public bool VerifyUploadedData()
{

    try
    {
        if (FileUpload1.HasFile)
        {
            sFileType = System.IO.Path.GetExtension(FileUpload1.FileName);
            sFileType = sFileType.ToLower();

            if (sFileType == ".xls")
            {
                string FilePath= System.Configuration.ConfigurationManager.AppSettings\["FilePath"\].ToString();
                FilePath = FilePath + FileUpload1.FileName;
                FileUpload1.SaveAs(Server.MapPath(FilePath));
             }
      }

Thanks

Dinesh Sharma