Stock/Stock_return.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class Stock_Stock_return : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            this.Label1.Text = Convert.ToString(Session["username"]);
            if (Convert.ToString(Session["username"]) == "")
            {
                Response.Write("<script language=javascript>alert('请登录');location='../login.aspx'</script>");
            }
            SqlConnection strcon = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["strcon"]);
            strcon.Open();
            SqlDataAdapter sda = new SqlDataAdapter("select * from tb_Commodity order by id desc",strcon);
            DataSet ds = new DataSet();
            sda.Fill(ds, "tb_Commodity");
            DataRowView rowview = ds.Tables["tb_Commodity"].DefaultView[0];
            int CommodityIds = Convert.ToInt32(rowview["CompanyId"]);

            this.CommodityId.DataSource = ds.Tables["tb_Commodity"];
            this.CommodityId.DataValueField = "id";
            this.CommodityId.DataTextField = "CommodityName";
            this.CommodityId.DataBind();
            SqlCommand scdc = new SqlCommand("select CompanyName from tb_Company where id=" + CommodityIds, strcon);
            this.CId.Text = Convert.ToString(scdc.ExecuteScalar());
            this.CompanyId.Value = CommodityIds.ToString();
            strcon.Close();

            this.StockDate.SelectedDate = DateTime.Now;
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string CommodityId=this.CommodityId.Text.ToString();
        string CompanyId=this.CompanyId.Value.ToString();
        int Number = Math.Abs(Convert.ToInt32(this.Number.Text));
        int Pirce =  Math.Abs(Convert.ToInt32(this.Pirce.Text));
        string StockDate=this.StockDate.SelectedDate.ToShortDateString();
        string SettlementType=this.SettlementType.Text.ToString();
        int Payment = Math.Abs(Convert.ToInt32(Request["Payment"]));
        int FactPayment = Math.Abs(Convert.ToInt32(this.FactPayment.Text));
        int NotPayment = Math.Abs(Convert.ToInt32(Request["NotPayment"]));
        string ManageMan=this.ManageMan.Text.ToString();
        string Username=Convert.ToString(Session["username"]);
        string AddTime=Convert.ToString(DateTime.Now);
        string Type = "进货退货";
        //计算输入的金额是否正确
        if (Number * Pirce < Payment)