C# how do I get the folder path automatically in ?

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C#

I have this

DirectoryInfo di = new DirectoryInfo(@"C:\Users\Yusuf\Desktop\excel\x");
Dosyalar = di.GetFiles("*.csv");

I want it detect directoryinfo automaticaly
My program is run inside excel folder

I used this command

DirectoryInfo di = new DirectoryInfo(Application.StartupPath);
Dosyalar = di.GetFiles("*.csv");

Its showing me files inside the excel folder but I want to see files inside excel\x

how can I see that?

What I have tried:

DirectoryInfo di = new DirectoryInfo(Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location));

DirectoryInfo di = new DirectoryInfo(Directory.GetCurrentDirectory());