Student.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 Student : System.Web.UI.Page
{
   
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                string SQL = "select * from TB_Department ";
                DataSet ds = DBHelper.GetDataSet(SQL);
                this.DropDownList2.DataSource = ds.Tables[0];
                this.DropDownList2.DataTextField = "Department";
                this.DropDownList2.DataValueField = "ID";
                this.DropDownList2.DataBind();
                GetClass();
                if (Request["ID"] != null)
                {
                    InitData();
                }
            }
        }

    private void GetClass()
    {
        string SQL = "select * from TB_Class where Department='"+this.DropDownList2.SelectedItem.Text+"'";
        DataSet ds = DBHelper.GetDataSet(SQL);
        this.DropDownList3.DataSource = ds.Tables[0];
        this.DropDownList3.DataTextField = "Class";
        this.DropDownList3.DataValueField = "Teacher";
        this.DropDownList3.DataBind();
        this.TextBox3.Text = this.DropDownList3.SelectedItem.Value;
    }
        protected void InitData()
        {

            string id = Request["ID"].ToString();

            try
            {

                string SQL = "select * from TB_Student where ID='" + id + "'";
                DataTable dt = DBHelper.GetDataSet(SQL).Tables[0];

                if (dt.Rows.Count > 0)
                {
                    this.TextBox1.Text = dt.Rows[0]["StudentID"].ToString();
                    this.TextBox2.Text = dt.Rows[0]["SutdentName"].ToString();
                    this.TextBox3.Text = dt.Rows[0]["Teacher"].ToString();

                    this.DropDownList1.Text = dt.Rows[0]["Sex"].ToString();