outstore/outstore_Add.aspx.cs

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

public partial class outstore_Add : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
                DataSet ds = SqlHelper.ExecuteforDataSet("select pid,pname from products");
        ddlpid.DataSource = ds;
        ddlpid.DataTextField = "pname";
        ddlpid.DataValueField = "pid";
        ddlpid.DataBind();

        txt_eno.Text = Session["lname"].ToString();

        }
    }
    protected void btnSave_Click(object sender, EventArgs e)
    {
        string sql = "select * from store where pid=" + ddlpid.SelectedValue;
        //根据编号得到相应的记录
        SqlDataReader sdr = SqlHelper.ExecuteReader(sql);
        if (sdr.Read())
        {
            if (int.Parse(sdr["quantity"].ToString()) < int.Parse(txt_quantity.Text))
            {
                MessageBox.Show(this, "出库数量不能大于库存数量！");
                return;
            }
        }
        else
        {
            MessageBox.Show(this, "该商品没有库存，不允许出库！");
            return;
        }
        
        StringBuilder strSql = new StringBuilder();
         strSql.Append(@"insert into Outstore ( pid,quantity,eno,outtime ) ");
        strSql.Append(@" values (@pid,@quantity,@eno,@outtime)");

        //设置参数
        SqlParameter[] parameters = new SqlParameter[] {
            new SqlParameter("@pid", SqlDbType.Int,4),
            new SqlParameter("@quantity", SqlDbType.Int,4),
            new SqlParameter("@eno", SqlDbType.VarChar,50),
            new SqlParameter("@outtime", SqlDbType.DateTime,8)        };

        parameters[0].Value =ddlpid.SelectedValue;