This sample program will help you to work with listbox using C#. This small demonstration will help you add items in listbox and get selected values from listbox.
There is two separate button for different functionalities.
OutPut:
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void btnClick_Click(object sender, EventArgs e)
{
lblOutput.Text = "Your selection is: <br>";
foreach (ListItem lst in lstSites.Items)
{
if (lst.Selected == true)
{
lblOutput.Text += lst.Text + "<br>";
}
}
}
protected void btnAddItem_Click(object sender, EventArgs e)
{
lstSites.Items.Add(txtInput.Text.ToString());
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ListBox ID="lstSites" runat="server" SelectionMode="multiple">
<asp:ListItem>IndiHub.com</asp:ListItem>
<asp:ListItem>BharatClick.com</asp:ListItem>
<asp:ListItem>SharepointBank.com</asp:ListItem>
<asp:ListItem>SoftwareTestingNet.com</asp:ListItem>
</asp:ListBox>
<br />
<br />
<asp:TextBox ID="txtInput" runat="server"></asp:TextBox>
<br />
<br />
<asp:Label ID="lblOutput" runat="server" Text="Label"></asp:Label>
<br />
<br />
<asp:Button ID="btnClick" runat="server" Text="Get Selected Items" OnClick="btnClick_Click" />
<asp:Button ID="btnAddItem" runat="server" Text="Add Items" OnClick="btnAddItem_Click" />
</div>
</form>
</body>
</html>
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