protected void Page_Load(object sender, EventArgs e) { Session["Local"] = "调拨单作业"; if (Session["LoginName"] == null) { PageUtil.showToast(this, "未获取到你的登陆状态,请退出系统重新登录!"); return; } else user = Session["LoginName"].ToString(); if (!IsPostBack) { DataSet ds_Invoice_no = invoiceDC.getExchangeInvoice_no(); if (ds_Invoice_no != null) { DropDownList_invoice_no.DataSource = ds_Invoice_no.Tables[0].DefaultView; DropDownList_invoice_no.DataValueField = "invoice_no"; DropDownList_invoice_no.DataTextField = "invoice_no"; DropDownList_invoice_no.DataBind(); } DropDownList_invoice_no.Items.Insert(0, "--选择调拨单号--"); } }