private void FillCategoryList()
 {
     CategoryBLL categorybll = new CategoryBLL();
     var c = categorybll.GetCategory();
     ddlCategory.DataSource = c;
     ddlCategory.DataTextField = "Category_Name";
     ddlCategory.DataValueField = "CategoryID";
     ddlCategory.DataBind();
 }
        void ComboDataBind()
        {
            CategoryBLL catBll = new CategoryBLL();
            var cat = catBll.GetCategory();
            ddlCategory.DataTextField = "Category_Name";
            ddlCategory.DataValueField = "CategoryID";

            ddlCategory.DataSource = cat;
            ddlCategory.DataBind();
            //ddlCategory.Items.Insert(0, "Choose Category ...");
            int catid = Convert.ToInt32(ddlCategory.SelectedValue.ToString());
            ddlItem_DataBind(catid);
        }