How to chnage the Message header which is genearted by validationattribute in MVC4

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ASP.NET

model

controller

MVC4

HI All,

Im working on MVC4,
We are validating the fileds in MODEL class using data annotation 'ValidationAtrtribute'.
Everything is working fine as functionally but while throwing messge to the user, popup meessage window having a Header like 'Message From Webpage' and first word of the alert message is 'Error:'.

Kindly let me know how to change the default message header and default word in alert message?

Thanks in Advance.....