Hi Sumeet,
Add the below line of code to the web config file.
<configuration>
<appSettings>
<add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />
</appSettings>
</configuration>
Or you can also add UnobtrusiveValidationMode="None" in the page like below.
<%@ Page Language="VB" AutoEventWireup="true" CodeFile="Default.aspx.vb" Inherits="_Default" UnobtrusiveValidationMode="None" %>