program to select roll number and display name vice versa using auto post back property.
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<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server" ForeColor="Red"
Text="DEMO OF AUTOPOSTBACK PROPERTY"></asp:Label>
<br />
<br />
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True">
<asp:ListItem>Select Enrollment No</asp:ListItem>
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
<asp:ListItem>3</asp:ListItem>
<asp:ListItem>4</asp:ListItem>
<asp:ListItem>5</asp:ListItem>
<asp:ListItem></asp:ListItem>
</asp:DropDownList>
<br />
<br />
</div>
<asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="True"
Height="38px" Width="148px">
<asp:ListItem>Select Name</asp:ListItem>
<asp:ListItem>Meru</asp:ListItem>
<asp:ListItem>Johar</asp:ListItem>
<asp:ListItem>sanjay</asp:ListItem>
<asp:ListItem>Akshay</asp:ListItem>
<asp:ListItem>Nikunj</asp:ListItem>
</asp:DropDownList>
<br />
<br />
<asp:Button ID="Button1" runat="server" Text="OK" />
<br />
<br />
<asp:ListBox ID="ListBox1" runat="server" Height="126px" Width="145px">
</asp:ListBox>
</form>
</body>
</html>
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Partial Class _Default
Inherits System.Web.UI.Page
Dim a As Integer
Dim b As Integer
Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged
a = DropDownList1.SelectedIndex
DropDownList2.SelectedIndex = a
ListBox1.Items.Clear()
End Sub
Protected Sub DropDownList2_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList2.SelectedIndexChanged
b = DropDownList2.SelectedIndex
DropDownList1.SelectedIndex = b
ListBox1.Items.Clear()
End Sub
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
ListBox1.Items.Add("Enrollment No:" & DropDownList1.SelectedItem.ToString())
ListBox1.Items.Add("Name:" & DropDownList2.SelectedItem.ToString())
End Sub
End Class-----------------------------------------output----------------------------------------------------
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| codestrew |
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