<%@ 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 Button1_Click(object sender, System.EventArgs e) {
Label1.Text = "You selected : " +
ListBox1.SelectedItem.Text.ToString();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>ListBox Example: How to Validate ListBox Control</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server" Font-Size="Large" ForeColor="Crimson" />
<br /><br />
<asp:Label ID="Label2" runat="server" Text="What you want to see?" />
<br />
<asp:ListBox ID="ListBox1" runat="server" SelectionMode="Single">
<asp:ListItem>RadioButton Example</asp:ListItem>
<asp:ListItem>RadioButtonList Example</asp:ListItem>
<asp:ListItem>CheckBox Example</asp:ListItem>
<asp:ListItem>CheckBoxList Example</asp:ListItem>
<asp:ListItem>PlaceHolder Example</asp:ListItem>
<asp:ListItem>AdRotator Example</asp:ListItem>
<asp:ListItem>Xml Example</asp:ListItem>
<asp:ListItem>DropDownList Example</asp:ListItem>
</asp:ListBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="ListBox1" ErrorMessage="Please select an Item">
</asp:RequiredFieldValidator>
<br /><br />
<asp:Button ID="Button1" runat="server" Text="Check ListBox Validation" OnClick="Button1_Click" />
</div>
</form>
</body>
</html>
<!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 Button1_Click(object sender, System.EventArgs e) {
Label1.Text = "You selected : " +
ListBox1.SelectedItem.Text.ToString();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>ListBox Example: How to Validate ListBox Control</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server" Font-Size="Large" ForeColor="Crimson" />
<br /><br />
<asp:Label ID="Label2" runat="server" Text="What you want to see?" />
<br />
<asp:ListBox ID="ListBox1" runat="server" SelectionMode="Single">
<asp:ListItem>RadioButton Example</asp:ListItem>
<asp:ListItem>RadioButtonList Example</asp:ListItem>
<asp:ListItem>CheckBox Example</asp:ListItem>
<asp:ListItem>CheckBoxList Example</asp:ListItem>
<asp:ListItem>PlaceHolder Example</asp:ListItem>
<asp:ListItem>AdRotator Example</asp:ListItem>
<asp:ListItem>Xml Example</asp:ListItem>
<asp:ListItem>DropDownList Example</asp:ListItem>
</asp:ListBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="ListBox1" ErrorMessage="Please select an Item">
</asp:RequiredFieldValidator>
<br /><br />
<asp:Button ID="Button1" runat="server" Text="Check ListBox Validation" OnClick="Button1_Click" />
</div>
</form>
</body>
</html>
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