Admin/BjList.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;

public partial class Admin_BjList : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            //显示班级列表
            DropDownList1.DataTextField = "学院名称";
            DropDownList1.DataValueField = "学院代码";
            DropDownList1.DataSource = db.GetData("select * from 学院");
            DropDownList1.DataBind();
            initDg();

        }
    }

    private void  initDg()
    {
        //显示班级列表
       this.GridView1.DataSource = db.GetData("SELECT * FROM dbo.学院 INNER JOIN dbo.班级 ON dbo.学院.学院代码 = dbo.班级.学院代码");
       this.GridView1.DataBind();
       this.TextBox1.Text = "";
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        //判断信息是否正确
        if (this.TextBox1.Text.Trim() == "")
        {
            Page.RegisterClientScriptBlock("onload", "<script>alert('班级名称不能为空');</script>");
            return;
        }
        if (db.GetData("select * from 班级 where 班级名称='" + this.TextBox1.Text.Trim() + "'").Rows.Count > 0)
        {
            Page.RegisterClientScriptBlock("onload", "<script>alert('名称重复');</script>");
            return;
        }
        //添加班级
        db.Execute("insert into 班级(班级名称,学院代码) values('" + this.TextBox1.Text.Trim() + "',"+ DropDownList1.SelectedValue +")");
        initDg();
    }
    protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        string idkey = this.GridView1.DataKeys[Convert.ToInt32(e.CommandArgument)]["班级代码"].ToString();
        if (e.CommandName == "Del")
        {
            //判断记录是否允许删除
            if (db.GetData("select * from 教师 where 班级代码=" + idkey + "").Rows.Count > 0)
            {