If you are considering to upgrade your Visual Basic 6.0 application to Visual Basic .NET or C#, remember that the recommended first step is to run Microsoft’s Code Advisor. The Code Advisor, according to the website:
The Code Advisor for Visual Basic 6 is an add-in used to review your code to ensure that it meets predetermined coding standards. The coding standards are based on best practices developed by Microsoft to produce robust and easy-to-maintain code.
The Code Advisor detects issues that are not converted automatically during the automatic migration, increasing the manual work required after running the conversion tools. These include Variant variables, late binding, soft binding of different objects, and others.
Check it out: Code Advisor for Visual Basic 6.0