admin/stores/Add3.aspx.cs

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using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.Data.SqlClient;
using System.Data;

public partial class stores_Add : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Label1.Text = Request.QueryString["q"];
        }
    }


    /// <summary>
    /// 编辑
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnSave_Click(object sender, EventArgs e)
    {
        if(int.Parse(Label1.Text)<int.Parse(txt_quantity.Text))
        {
            Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "<script>alert('退货数量不能大于库存数量!');</script>");
            return;
        }

        //更新   
        SqlHelper.ExecuteNonQuery("update Stores set quantity=quantity-" + txt_quantity.Text + " where id=" + Request.QueryString["id"]);

        Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "<script>alert('操作成功，请返回!');location.href='List.aspx';</script>");
    }


}