การใช้ PostBackUrl กับ Request.Form.Get ครับ ช่วยทีครับ มือใหม่ ASP.NET by C#

Button BtnSave1 = (Button)(e.Item.FindControl("BtnSave1"));
HiddenField hdTextID = (HiddenField)(e.Item.FindControl("hdTextID"));
if (BtnSave1 != null)
{
    if (DataBinder.Eval(e.Item.DataItem, "PermitRec").ToString() == "2" || DataBinder.Eval(e.Item.DataItem, "PermitRec").ToString() == "3")
    {
        BtnSave1.Visible = false;
    }
    else
    {
        hdTextID.Value = DataBinder.Eval(e.Item.DataItem, "TextID").ToString();
        BtnSave1.PostBackUrl = "~/webform2.aspx";
        BtnSave1.Visible = true;
    }
}