how can i show GridView when i click an item from a dropdownlist ASP c#

[BLUE!]

\[code\]protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e){ DropDownList1.AutoPostBack = true; Class1 cc = new Class1(); string k = DropDownList1.SelectedItem.Text; DataTable l = cc.table1(k); GridView g = new GridView(); g.DataSource = l; g.DataBind();}\[/code\]