Validate Dropdownlist using Require filed validator control in asp.net OR can we validate Dropdownlist by Requirefield validator

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

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 Display message and header when Gridview is empty in asp.net.

We can validate the Dropdownlist using Requirefield validator via set the InitialValue property of Requirefield validator control.

Example:

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

<center>

    <fieldset style="width:30%;height:150px">

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

       Please Select Country : <asp:DropDownList ID="ddlcountry" runat="server" Width="20%">

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

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

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

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

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

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

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

        </asp:DropDownList>

                <asp:RequiredFieldValidator ID="rfvcountry" ControlToValidate="ddlcountry" InitialValue="0" runat="server" ErrorMessage="Please select Country"></asp:RequiredFieldValidator>

        </fieldset>

        </center>

Build and run the project.

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