Class.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 Class : 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.DropDownList1.DataSource = ds.Tables[0];
                this.DropDownList1.DataTextField = "Department";
                this.DropDownList1.DataValueField = "ID";
                this.DropDownList1.DataBind();
                if (Request["ID"] != null)
                {
                    InitData();
                }
            }
        }
        protected void InitData()
        {

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

            try
            {

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

                if (dt.Rows.Count > 0)
                {
                    this.DropDownList1.Text = dt.Rows[0]["Department"].ToString();
                    this.TextBox1.Text = dt.Rows[0]["Class"].ToString();
                    this.TextBox2.Text = dt.Rows[0]["Teacher"].ToString(); 
                }
            }
            catch
            {
            }

        }


 
        protected void Button1_Click(object sender, EventArgs e)
        {
        
            string SQL = "";