Score.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_Semester ";
                DataSet ds = DBHelper.GetDataSet(SQL);
                this.DropDownList1.DataSource = ds.Tables[0];
                this.DropDownList1.DataTextField = "Semester";
                this.DropDownList1.DataValueField = "ID";
                this.DropDownList1.DataBind();



                string SQL2 = "select * from TB_KeMu ";
                DataSet ds2 = DBHelper.GetDataSet(SQL2);
                this.DropDownList2.DataSource = ds2.Tables[0];
                this.DropDownList2.DataTextField = "KeMu";
                this.DropDownList2.DataValueField = "ID";
                this.DropDownList2.DataBind();


                string SQL3 = "select * from TB_Student ";
                DataSet ds3 = DBHelper.GetDataSet(SQL3);
                this.DropDownList3.DataSource = ds3.Tables[0];
                this.DropDownList3.DataTextField = "StudentID";
                this.DropDownList3.DataValueField = "SutdentName";
                this.DropDownList3.DataBind();
                this.TextBox2.Text = this.DropDownList3.SelectedItem.Value;
                if (Request["ID"] != null)
                {
                    InitData();
                }
            }
        }

 
        protected void InitData()
        {

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

            try
            {

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