webpage designs affected after alert message

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ASP.NET

Javascript

Hi Expert,

I am developing a website in asp.net.

On AddNewUser page ,i am adding a new user.

After adding user successfully i have to show alert message that user added successfully.

For this i wrote a code like below

Response.Write("<script>alert('User added successfully')</script>");

When i add new user this message alert appear nicely.But after dismissing that webpage design looks get changed unless i refresh page.

Please help me.

Thanks in advance....