Settled. The following works for me: LIKE CONCAT('%', @AccountCode, '%')
protectedvoidrcbAccountCode_ItemsRequested(objectsender, RadComboBoxItemsRequestedEventArgs e){ stringMysql = "SELECT * FROM rfaccount WHERE AccountCode LIKE CONCAT('%', @AccountCode, '%')"; MySqlDataAdapter adapter = newMySqlDataAdapter(Mysql, ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString); adapter.SelectCommand.Parameters.AddWithValue("@AccountCode", e.Text); DataTable dt = newDataTable(); adapter.Fill(dt); RadComboBox comboBox = (RadComboBox)sender; // Clear the default Item that has been re-created from ViewState at this point. comboBox.Items.Clear(); foreach(DataRow row indt.Rows) { RadComboBoxItem item = newRadComboBoxItem(); item.Text = row["AccountCode"].ToString(); item.Value = row["AccountId"].ToString(); item.Attributes.Add("AccountName", row["AccountName"].ToString()); comboBox.Items.Add(item); item.DataBind(); }}