How to set file path to a file in project folder

 Take a look at System.IO.Path[^] class, it performs operations on string instances that contain file or directory path information.

To read/write a file, that is located where your program runs, you can uses something like this:

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string fileToRead = System.IO.Path.GetDirectoryName(Application.ExecutablePath) + @"\MyOtherFile.xml";

string allDataFromFile = System.IO.File.ReadAllText(fileToRead);