Init DropList and Multi-level interaction

   protected void InitDDLProcess()
        {
            string sqlstr = "select ProcessID, ProcessName from T_ProcessInfo";
            DataTable DTCase = SQLCon.GetData(sqlstr);
            for (int i = 0; i < DTCase.Rows.Count; i++)
            {
                string text = DTCase.Rows[i]["ProcessID"].ToString();

                //not add same item
                if (DDLGroup.Items.FindByValue(text) != null)
                { }
                else
                {
                    string value = (string)DTCase.Rows[i]["ProcessName"];
                    DDLProcess.Items.Add(new ListItem(value, text));
                }
            }
        }

 DropDownList dl =  sender as DropDownList;
string GroupID = dl.SelectedValue;

about multi-level  interaction ,we may add some cache,  not every time select data from db, so
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