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()
        {
            try
            {


                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;
            }
            catch
            {


            }
        }
        protected void InitData()
        {

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

            try
            {