Windows Form updating problem

[C# Programming]

I got a bug in the application which is as follows

When i am doing login to my application, welcome window will come with the login name and at the same time the update page will also be shown minimized... at this time i can do the modification in name and i press the update button it will make the changes to the welcome ********. but when i close this update page and reopen the same.. and i perform the same task again. it is not getting updated in the welcome ********.

Any idea for this bug to be cleared..