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Monday, September 16, 2013
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How to use RequiredFieldValidator on ListBox in ASP.NET

5:15 AMMonday, September 16, 2013
If you want to apply RequiredField Validator to ListBox control then you should drop Required FieldValidator on design window. In previous example how to use RequiredFieldValidator control.

<%@ Page Language="C#" %>

<!DOCTYPE html>

<script runat="server">

    protected void Button1_Click(object sender, EventArgs e)
    {
        Label1.Text = "you are selected <br/>" + ListBox1.SelectedItem.Text;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
 
        <asp:ListBox ID="ListBox1" runat="server" Height="136px" Width="110px">
            <asp:ListItem>Apple </asp:ListItem>
            <asp:ListItem>Mango</asp:ListItem>
            <asp:ListItem>Orange</asp:ListItem>
        </asp:ListBox>
        <br />
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="ListBox1" ForeColor="#FF3300">Select any one in given list</asp:RequiredFieldValidator>
        <br />
        <asp:Label ID="Label1" runat="server"></asp:Label>
        <br />
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Submit" />
 
    </div>
    </form>
</body>
</html>

Output
How to use RequiredFieldValidator on ListBox in ASP.NET

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