Ah ha! hey everyone.
I have a solution. Now I make two program, one by C# and one by vb6. Vb6 program will run automatically on pc then it checks exist .Net framework. If pc exist .Net framework then stop running vb6 program. If pc not yet install .Net framework so vb6 program auto download .Net framework setup file. When download finish vb6 program stop running on pc. And C# program just run when it called. So my problem now is how to make one vb6 program auto running on pc when pc start or started. I don't ever make vb6. Who can help me this problem.