UI1/teachermanage.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 BLL;
using System.Windows.Forms;
public partial class teachermanage : System.Web.UI.Page
{
    BLL.teachermanage teachermanager = new BLL.teachermanage();
    
    protected void Page_Load(object sender, EventArgs e)
    {
        if (int.Parse(Session["grade"].ToString()) > 1)
        {
            Response.Redirect("faliur.aspx");
        }
        if (!IsPostBack)
        {
            seleteAll();
        }
      
    }
    public void seleteAll()
    {
        DataTable dt=new DataTable();
        dt = teachermanager.selectAll();
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }
    protected void btnAdd_Click(object sender, EventArgs e)
    {
       
        DataTable dt = teachermanager.selectAll();
          
        if (txtloginpwd.Text.Length <= 0)
        {
            Page.RegisterStartupScript(" ", "<script>confirm('教师工号不能为空')</script>");
            return;
           
        }
        if (txtloginname.Text.Length <= 0)
        {

            Page.RegisterStartupScript(" ", "<script>confirm('教师姓名不能为空')</script>");
            return;
         }
        if ((txtloginpwd.Text.ToString()) == (dt.Rows[0]["LoginPwd"].ToString()))
        {
            Page.RegisterStartupScript(" ", "<script>confirm('教师工号已存在')</script>");
            return;
        }
        if (txtloginpwd.Text.Substring(0, 1) != drpDepartment.SelectedValue.Substring(0, 1))
        {
            Page.RegisterStartupScript(" ", "<script>confirm('教师名与所在系不一致')</script>");