Validate Listbox using Require filed validator control in asp.net

Introduction: In this article today I will explain how we can Validate Listbox using Require filed validator control in asp.net 

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Description: 

 In the previous article I have explained Show Gridview row detail in Tooltip on mousehover using Jquery in asp.net;Fill dropdownlist with days, month and year in asp.net,Server side validation in MVC Razor using data annotation,Like linq query example and bind gridview,Create a dynamic Slider in asp.net, URL routing in asp.net website and Validate Dropdownlist using Require filed validator control in asp.net.

Example:

Add a webform to project. Drag and drop the Listbox control from toolbox to webform.

<center>

    <fieldset style="width:30%;height:100px">

    <legend>Validate Listbox using Requirefield validator control</legend>

       Please Select Country : <asp:ListBox runat="server" ID="lstboxcountry" Width="35%">

        <asp:ListItem Value="0">--Select Country--</asp:ListItem>

       <asp:ListItem Value="1">India</asp:ListItem>

 <asp:ListItem Value="2">China</asp:ListItem>

 <asp:ListItem Value="3">Russia</asp:ListItem>

 <asp:ListItem Value="4">Cuba</asp:ListItem>

 <asp:ListItem Value="5">Iran</asp:ListItem>

 <asp:ListItem Value="6">Brazil</asp:ListItem>

 <asp:ListItem Value="7">Sri lanka</asp:ListItem>

       </asp:ListBox>

       </br>                

                <asp:RequiredFieldValidator ID="rfvlstboxcountry"

            ControlToValidate="lstboxcountry" InitialValue="0" runat="server"

            ErrorMessage="Please select Country" ForeColor="#FF3300"></asp:RequiredFieldValidator>

        </fieldset>

        </center>

Note: If not want “—Select Country—“ option then set the InitialValue="".

Build and run the project.

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