Project deployment issue

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C#

C#4.0

Sir,

I have built a solution in which I have two projects. First project is about the login info. If, a user suceessfully logs on then the second project application is executed.
It is working fine while I run it in debug mode on local system.

But, I am facing issues after I deploy the projects. Looks like I am doing some mistake that I don't know. When I install it on client PC, I get the login form. After entering the login info, it is not switching to my another project application form.

I believe, I am making some mistake while deployment only.
Any help please, it is little urgent. I have to give the demo to my client in a day or two.

Thanks in advance.