File Upload not Show Value on Page Load

if (fluplogo.HasFile)//Here  Value of File upload  Is Null
        {
            string FilePath = "";
            string[] a = new string[1];
            string fileName = "";
            string FullName = "";
            try
            {
                if (fluplogo.FileName.Length > 0)
                {
                    a = fluplogo.FileName.Split('.');
                    fileName = Convert.ToString(System.DateTime.Now.Ticks) + "." + a.GetValue(1).ToString();
                    FilePath = Server.MapPath(@"~\InstituteLogo");
                    fluplogo.SaveAs(FilePath + @"\" + fileName);

                    FullName = FilePath + @"\" + fileName;
                    // Database Save Operation of filename.

                }
            }
            catch
            {
            }
        }