protected void btnsort_Click(object sender, EventArgs e) { String expression = GrdATDataView.Columns[0].HeaderText; String Dire = ""; SortDirection direction; switch (DropDownList1.SelectedValue.ToString().Trim()) { case "asc": direction = SortDirection.Ascending; Dire = " Asc"; break; case "des": direction = SortDirection.Descending; Dire = " Desc"; break; default: direction = SortDirection.Ascending; break; } DT.DefaultView.Sort = "PRODUCT_GROUP_DESC " + Dire; //here this error. GrdATDataView.DataSource = DT; GrdATDataView.DataBind(); }
DropDownList1.SelectedValue
var
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