Thanks for the reply ErnestoM.
I had created webservice Data Connection & connecting 'GetUserProfileByName' webservice. After that I have dragged AccountName attribute on my form and passing UserID in that textbox to retrieve FName, LName & Email in 3 different textboxes. I have also checked checkbox "Update the value when the result of the formula is recalculated" on 3 texboxes so that on change I can get updated values.
Now whenever I am updating the UserID I am getting updated FName,LName & Email. But when I enter incorrect UserID it gives error.
Is ther any approach to retrieve data, if we can not supress this message?
Thanks