salary/Manage.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;

public partial class salary_Manage : System.Web.UI.Page
{
       protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            btnDelete.Attributes.Add("onclick", "return confirm(\"你确认要删除吗？\")");
        DataSet dstno = SqlHelper.ExecuteforDataSet("select tno,tname from teachers");
        ddltno.DataSource = dstno;
        ddltno.DataTextField = "tname";
        ddltno.DataValueField = "tno";
        ddltno.DataBind();
        ddltno.Items.Insert(0, new ListItem("---全部---", ""));


            bind();
        }
    }

    // 绑定
    private void bind()
    {
     

        string where = " where 1=1 ";

        if (ddltno.SelectedValue!= "")
        {
            where += " and a.tno='" + ddltno.SelectedValue + "' ";
        }



        GridView1.DataSource = SqlHelper.ExecuteforDataSet("select a.*,b.tname from salary a  left join teachers b on a.tno=b.tno " + where + " order by sid desc");
        GridView1.DataBind();

        object ob = SqlHelper.ExecuteScalar("select sum(shif) from salary a  left join teachers b on a.tno=b.tno " + where);
      

        Label1.Text = ob.ToString()==""?"0":ob.ToString();
    }

    /// <summary>
    /// 分页事件
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {