How Do I display Form from another project withn my Visual C# Application?

Im developing a Windows application (not web-based) using Visual Studio 2008 running under Windows XP Business. Im programming in Visual C#.

My solution (*.sln) file contains 2 projects each of which contain several classes. One of the projects contains the Windows user interface eg. the windows that the project will display.

Lets say the solution file is called bob.sln
And bob.sln contains 2 projects which are;

UserInterface
Calculations

The UserInterface project contains a form called ResultWindow.cs
The Calculations project contains a file(class) called result.cs

Within result.cs I want to do this;

ResultWindow test = new ResultWindow();
test.Show();

But how do I get access to the ResultWindow form from result.cs?

Can I do this? I think I should be using a "using" statement at the beginning of result.cs so I can access ResultWindow form but Ive had no joy trying this.
rangers99Asked:
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angus_young_acdcConnect With a Mentor Commented:
Unfortunately not.  It is likely because you have a reference to Calculations in UserInterface.

You will either have to re-work all your references, or just add a Form to your Calculations class (changing it to a Win App Class) and open it from there.
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angus_young_acdcCommented:
You will need to add a reference in your Calculations project to the UserInterface project.  Right click References, then select Projects and then add it.  Now you should be able to right click on ResultWindow and add the using statement (or just type using ResultWindow at the top of the code).
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rangers99Author Commented:
Thanks Angus. I just tried that and got this error message;

"A reference to 'UserInterface' could not be added. Adding this project as a reference would cause a circular dependency."

Is there any way round this problem?
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