ASP.Net/Validation by Control/Validation Focus

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RequiredFieldValidator on focus leave event (C#)

   <source lang="csharp">

<%@ Page Language="C#" %> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>Show SetFocusOnError</title>

</head> <body>

   <form id="form1" runat="server">
   <asp:Label
       id="lblFirstName"
       Text="First Name"
       AssociatedControlID="txtFirstName"
       Runat="server" />
   
<asp:TextBox id="txtFirstName" Runat="server" /> <asp:RequiredFieldValidator id="reqFirstName" ControlToValidate="txtFirstName" Text="(Required)" SetFocusOnError="true" Runat="server" />

<asp:Label id="lblLastName" Text="Last Name" AssociatedControlID="txtLastName" Runat="server" />
<asp:TextBox id="txtLastname" Runat="server" /> <asp:RequiredFieldValidator id="reqLastName" ControlToValidate="txtLastName" Text="(Required)" SetFocusOnError="true" Runat="server" />

<asp:Button id="btnSubmit" Text="Submit" Runat="server" />
   </form>

</body> </html>

      </source>
   
  


Validate control on lost focus (C#)

   <source lang="csharp">

<%@ Page Language="C#" %> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">

   <title>Show SetFocusOnError</title>

</head> <body>

   <form id="form1" runat="server">
   <asp:Label
       id="lblFirstName"
       Text="First Name"
       AssociatedControlID="txtFirstName"
       Runat="server" />
   
<asp:TextBox id="txtFirstName" Runat="server" /> <asp:RequiredFieldValidator id="reqFirstName" ControlToValidate="txtFirstName" Text="(Required)" SetFocusOnError="true" Runat="server" />

<asp:Label id="lblLastName" Text="Last Name" AssociatedControlID="txtLastName" Runat="server" />
<asp:TextBox id="txtLastname" Runat="server" /> <asp:RequiredFieldValidator id="reqLastName" ControlToValidate="txtLastName" Text="(Required)" SetFocusOnError="true" Runat="server" />

<asp:Button id="btnSubmit" Text="Submit" Runat="server" />
   </form>

</body> </html>

      </source>