Required attribute in ASP Control

Question

I want to know how to use required attribute in asp.net. .In html I used required attribute for mandatory fields. How to use it in asp .net?

I tried this so far, is it correct?

<p class="field-wrapper required-field">
   <label>First Name</label>
   <asp:TextBox ID="TextBox1" name="f_name" runat="server" required>
   </asp:TextBox>
</p>

Answer 1

there's no required attribute. you have to use a RequiredFieldValidator

<asp:TextBox ID="TextBox1" name="f_name" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator runat="server" id="reqName" controltovalidate="TextBox1" errormessage="Please enter a value!" />