How to implement "open with" in C#?

Question

C++ / C#

Created a couple of applications for working with text and images. When I run them through "open with" it just appears a new file. How can I write that would immediately open the selected file?

Answer 1

Environment.GetCommandLineArgs()

Answer 2

Use an application like process explorer that allows you to view startup options and run "open with" again.
You will clearly see that the command line will be of the form:
".exe" ".ext"
And already in your application process the command line input parameters.