store/store_Edit.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 store_Edit : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            ShowInfo();
        }
    }

       // 初始化
    protected void ShowInfo()
    {
        DataSet ds = SqlHelper.ExecuteforDataSet("select pid,pname from products");
        ddlpid.DataSource = ds;
        ddlpid.DataTextField = "pname";
        ddlpid.DataValueField = "pid";
        ddlpid.DataBind();


        string sql = "select * from store where sid=" + Request.QueryString["id"] ;
        //根据编号得到相应的记录
        SqlDataReader sdr = SqlHelper.ExecuteReader(sql);
        if (sdr.Read())
        {
            ddlpid.SelectedValue=sdr["pid"].ToString();
            txt_quantity.Text = sdr["quantity"].ToString();
        }
    }

    // 保存
    protected void btnSave_Click(object sender, EventArgs e)
    {
        StringBuilder strSql = new StringBuilder();

        //更新   
        strSql.Append("update store set ");
        strSql.Append("pid = @pid,");
        strSql.Append("quantity = @quantity ");
        strSql.Append("  where sid=@sid");
        int sid = int.Parse(Request.QueryString["id"]);

        //设置参数
        SqlParameter[] parameters = new SqlParameter[] {
                    new SqlParameter("@sid", SqlDbType.Int,4),
                    new SqlParameter("@pid", SqlDbType.Int,4),
                    new SqlParameter("@quantity", SqlDbType.Int,4)  };