How to prompt the “Choose a default program” in code?

Question

I am writing a program with a listbox filled with items, and when you right click the item, context menu will pop up and have an option to choose call \"Open with\", and my

Answer 1

You can use this way to show "Open With" dialog directly：

string FilePath = "C:\\Text.txt";//Your File Path
System.Diagnostics.Process proc = new System.Diagnostics.Process();
proc.EnableRaisingEvents = false;
proc.StartInfo.FileName = "rundll32.exe";
proc.StartInfo.Arguments = "shell32,OpenAs_RunDLL " + FilePath;
proc.Start();