ASP.net RequiredFieldValidator VisualStudio 2012

Question

I am developing a project with ASP.net c#. I want RequiredFieldValidator to check my textbox. I am adding validator, and it works perfectly fine in Visual Studio 2010. But once

Answer 1

protected void Page_Load(object sender, EventArgs e)
{
    this.UnobtrusiveValidationMode =System.Web.UI.UnobtrusiveValidationMode.None;
}

Just copy & paste in C# Code