[Solved] ASP.Net Request.QueryString value is null

Hi

When i save / update record value in SaveMethod is null.

public string SaveMethod;
protected void Page_Load(object sender, EventArgs e)
{     
    try
    { 
        if (!Page.IsPostBack)
        {
            hdfLoginCode.Value = Utility.GetUserInfo().Item4;
 
            if (!String.IsNullOrEmpty(Request.QueryString["val"]))
            {
                GetData(Convert.ToInt32(AES.Decrypt(Request.QueryString["val"])));
            }
 
            if (!String.IsNullOrEmpty(Request.QueryString["AU"]))
            {
                SaveMethod = Request.QueryString["AU"];
                if (SaveMethod == "A")
                {
                    btnSubmit.Text = "Save";
                }
            }
            else
            {
                Response.Redirect("QuestionList");
            }
        }
    }
    catch (Exception ex)
    {
        Utility.SaveErrorLog(ex.Message, System.IO.Path.GetFileName(Request.Path), System.Reflection.MethodBase.GetCurrentMethod().Name, Convert.ToInt32(hdfLoginCode.Value));
        ShowMessage("Oops...", ex.Message, "error");
    }
}
 
**********************************************
protected void btnSubmit_Click(object sender, EventArgs e)
{
    try
    {
        if (SaveMethod == "U")
        {
        }
    }
}

Thanks