Open Files Easily with C# - Learn How to Use Associated Applications

Opening files in a C# application can be a bit tricky, especially if you want to use the default program associated with that file type. Luckily, there is a simple solution that allows you to open files with their associated applications using C#.

  1. The Process
  2. Conclusion

The Process

The first step is to get the file path and the associated application. You can do this using the Process.StartInfo class.

string filePath = "path/to/your/file";
ProcessStartInfo startInfo = new ProcessStartInfo {
    FileName = filePath,
    UseShellExecute = true

The FileName property is used to set the path to the file you want to open. The UseShellExecute property must be set to true in order to use the default program associated with the file type.

The next step is to create a new instance of the Process class and start the process.

using (var process = new Process()) {
    process.StartInfo = startInfo;

This will open the file with its associated application. It's that simple!


Using C# to open files with their associated applications is a simple and straightforward process. By using the Process.StartInfo class and the Process class, you can easily open files with their default programs.

If you are looking to add this functionality to your C# application, give it a try and see how it works for you!

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