How to modify a C# console application to use a constant for a directory path?

I am developing a C# console application.

How would you modify the following directory paths using a constant so that if the directory path were to change, I wouldn't have to make mulitple changes?

Currently I point to path u:\Harris\ which is where my files currently reside.

  class Class1
        static void Main(string[] args)

            string goodFilePath = @"f:\Harris\BK.BK.ARB4.ARB4.77.1.ard.ind";
            string emptyFilePath = @"f:\Harris\HRSBK.BK.B4.B4.77.1.ard";
            string tiffFilePath = @"f:\Harris\BK.BK.ARB4.ARB4.77.1.ard.out";
            string errorFilePath = @"f:\Harris\Check.err.txt";

            if (File.Exists(goodFilePath))

            if (File.Exists(emptyFilePath))

            if (File.Exists(tiffFilePath))

            if (File.Exists(errorFilePath))

            DirectoryInfo parentDirectory = new DirectoryInfo(@"f:\Harris");
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käµfm³d 👽Commented:
const string TARGET_DIR = @"f:\Harris\";

string goodFilePath = Path.Combine(TARGET_DIR, "BK.BK.ARB4.ARB4.77.1.ard.ind");
string emptyFilePath = Path.Combine(TARGET_DIR, "HRSBK.BK.B4.B4.77.1.ard");
string tiffFilePath = Path.Combine(TARGET_DIR, "BK.BK.ARB4.ARB4.77.1.ard.out");
string errorFilePath = Path.Combine(TARGET_DIR, "Check.err.txt");

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