Как отобразить данные двух таблиц в одном datalist, выбрав изменение индекса в раскрывающемся списке в C#
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="FinalStudentDetail.aspx.cs" Inherits="FinalStudentDetail" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<tr>
<th colspan="3">Achievement Records</th>
</tr>
<tr>
<td>Select Student</td>
<td>:</td>
<td>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"></asp:DropDownList>
</td>
</tr>
</table>
<asp:DataList ID="DataList1" runat="server" OnItemCommand="DataList1_ItemCommand" OnItemDataBound="DataList1_ItemDataBound">
<ItemTemplate>
<table border="1">
<tr>
<td colspan="2">
<asp:Label ID="lb_id" Text='<%#Eval("exmNam") %>' runat="server" />
</td>
</tr>
<tr>
<td><%# Eval("scrSubName") %></td>
<td><%# Eval("scrAch") %></td>
</tr>
</table>
</ItemTemplate>
<AlternatingItemTemplate>
<table border="1">
<tr>
<td colspan="2">
<asp:Label ID="lb_id" Text='<%#Eval("exmNam") %>' runat="server" />
</td>
</tr>
<tr>
<th>Subject Name</th>
<th>Achievement</th>
</tr>
<tr>
<td><%# Eval("scrSubName") %></td>
<td><%# Eval("scrAch") %></td>
</tr>
</table>
</AlternatingItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:DataList>
</div>
</form>
</body>
</html>
<pre>using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
public partial class FinalStudentDetail : System.Web.UI.Page
{
SqlConnection con = new SqlConnection();
protected void Page_Load(object sender, EventArgs e)
{
con.ConnectionString = ConfigurationManager.ConnectionStrings["cn"].ConnectionString;
if (con.State == ConnectionState.Closed)
{
con.Open();
Response.Write(@"<script language='javascript'>alert('Connection is open')</script>");
}
if (Page.IsPostBack == false)
{
DropDownList1_Bind();
}
}
public void DropDownList1_Bind()
{
SqlCommand cmd = new SqlCommand("select * from tbStu", con);
SqlDataReader sdr = cmd.ExecuteReader();
DropDownList1.DataValueField = "stuCod";
DropDownList1.DataTextField = "stuNam";
DropDownList1.DataSource = sdr;
DropDownList1.DataBind();
DropDownList1.Items.Insert(0, "Select Student");
sdr.Close();
cmd.Dispose();
}
public void DataList_Bind()
{
String query;
query= "select distinct exmNam from tbExm;select stuNam, exmNam,scrSubName,scrAch from tbScr,tbStu,tbExm where scrStuCod=stuCod and scrExmCod=exmCod and stuCod=@Cod";
SqlDataAdapter sda = new SqlDataAdapter(query,con);
sda.SelectCommand.Parameters.AddWithValue("@Cod", DropDownList1.SelectedValue);
DataSet ds = new DataSet();
sda.Fill(ds);
DataList1.DataSource = ds;
DataList1.DataBind();
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
DataList_Bind();
}
protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
{
}
}
Что я уже пробовал:
проблема в том, что данные одной таблицы различны, а данные второй таблицы, основанные на columnswise и формате, должны быть такими же, о которых я упоминал выше.