private void InitCustomer()
{
CustomerBll customerBll = new CustomerBll();
DataSet ds = customerBll.GetAllCustomer();
ddlCustomerList.DataSource = ds;
ddlCustomerList.DataTextField = "CustomerName";
ddlCustomerList.DataValueField = "CustomerId";
ddlCustomerList.DataBind();
ddlCustomerList.Items.Insert(0, new ListItem("--请选择--", "0"));
}