My Not Working

Do you require me instead of my

No
You need to write My
It is case sensitive
https://www.w3computing.com/vb2008/using-computer-filesystem-component/

Are you writing a VB.Net app? What kind of project (winforms, wpf, ...)?

Pretty sure that your issue comes from the fact that MyDocuments property cannot be used to initialized a constant. Replace Const with Dim and the error will be solved.

BTW, VB.Net is not case-sensitive.

Yes try Dim
You cannot declare a constant like that
It should be Dim as it's a variable
Const is always a fixed value like
Const x = 300

This didi not work

Dim f As String = My.Computer.FileSystem.SpecialDirectories.MyDocuments

I check another project.  It's shows that My is { } Namespace

How do I get this Namespce into this application?

Again: Are you writing a VB.Net app? What kind of project (winforms, wpf, ...)?

Which framework are you targeting? 

You want to ensure that you have imported the Microsoft.VisualBasic namespace.

HTH,

-saige-

It's a VB.NET App and I'm using Framework 4.8

can you provide the exact error? what type of project is it?

        Dim x As String = My.Computer.FileSystem.SpecialDirectories.MyDocuments

        Dim y As String = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)

My. does not work. It showing My is not declared.  It may be inaccessible due to its protection level.

My workaround is the 2nd one.  It works.  However, I prefer using the 1st one.

again: what type of project is it?

have you tried targeting the 4.7.2 framework? (which framework is your other project targeting)?

I really suspect that you are using a project type that is incompatible with the My Namespace.

If you create a demo Windows Forms project, the My Namespace will be automatically created for you as shown here:

As I stated, ensure that you have a reference to Microsoft.VisualBasic and have imported the namespace.

-saige-

Yeah :(  I upraded to the recommended 4.8 and it broke things.  Do you  think i should go back to 4.7.2?

The property, My.Computer.FileSystem.SpecialDirectories.MyDocuments, is available in .NET Framework 4.8.

https://docs.microsoft.com/en-us/dotnet/api/microsoft.visualbasic.fileio.specialdirectories.mydocuments?view=netframework-4.8#microsoft-visualbasic-fileio-specialdirectories-mydocuments

As I stated before, add a reference to Microsoft.VisualBasic and ensure that you have it imported.

-saige-

I may go back to 4.8 for now until I can find out the difference between


SpecialDirectories.MyDocuments Property (Microsoft.VisualBasic.FileIO) | Microsoft Docs 

Check this out

Difference Between .NET and .NET Core (c-sharpcorner.com) 

After reading this I may go back to 4.8

What's new in .NET 5 | Microsoft Docs 

Much thanks to all!