Admin/AddCourseInfo.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 System.Data.SqlClient;
public partial class Admin_AddCourseInfo : System.Web.UI.Page
{
    SqlHelper data = new SqlHelper();

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {

            GetXueYuan();

            DropDownList2.DataSource = data.GetDataReader("select * from  ClassInfo where XueYuanId='"+DropDownList1.SelectedValue+"'");
            DropDownList2.DataTextField = "name";
            DropDownList2.DataValueField = "id";
            DropDownList2.DataBind();

            DropDownList3.DataSource = data.GetDataReader("select * from  Teachter");
            DropDownList3.DataTextField = "Name";
            DropDownList3.DataValueField = "id";
            DropDownList3.DataBind();

        }
    }
    private void GetXueYuan()
    {

        DropDownList1.DataSource = data.GetDataReader("select * from  XueYuan");
        DropDownList1.DataTextField = "Name";
        DropDownList1.DataValueField = "id";
        DropDownList1.DataBind();



    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        data.RunSql("insert into CourseInfo(name,XueYuanId,XueYuanName,ClassId,ClassName,Tid,TName,xueNian,DiDian,ShengKeSJ,ZuiDaRenShu)values('" + TextBox2.Text + "','" + DropDownList1.SelectedValue + "','" + DropDownList1.SelectedItem.Text + "','" + DropDownList2.SelectedValue + "','" + DropDownList2.SelectedItem.Text + "','" + DropDownList3.SelectedValue + "','" + DropDownList3.SelectedItem.Text + "','"+TextBox1.Text+"','"+TextBox3.Text+"','"+TextBox4.Text+"','"+TextBox5.Text+"')");
        Alert.AlertAndRedirect("添加成功", "AddCourseInfo.aspx");
    }

    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        DropDownList2.DataSource = data.GetDataReader("select * from  ClassInfo where XueYuanId='" + DropDownList1.SelectedValue + "'");
        DropDownList2.DataTextField = "name";
        DropDownList2.DataValueField = "id";
        DropDownList2.DataBind();

    }
}