1.找ddl select index 的方式
if (ddl_DeviceList.Items.FindByText (Device_Type) != null)
ddl_DeviceList.Items.FindByText(Device_Type).Selected = true;
if (ddl_DeviceList.Items.FindByValue(Device_Type) != null)
ddl_DeviceList.Items.FindByValue(Device_Type).Selected = true;
2.ddl連接資料庫
ddl_DeviceList.DataValueField = "DeviceType_Id"; //在此輸入的是資料表的欄位名稱
ddl_DeviceList.DataTextField = "DeviceName"; //在此輸入的是資料表的欄位名稱
ddl_DeviceList.DataSource = dstDevices.DefaultView;
ddl_DeviceList.DataBind();