I suppose the best answer to the question is that System.Windows.Forms.DataGridView is part of .Net and there's nothing specific to PowerShell there.
If you're doing enough work in PowerShell and a lot of it is using C# the needs conversion to PowerShell, have a look at PowerShell Pro Tools. The paid version has a converter, but one-to-one conversion in either direction (in any languages) is hardly ever completely satisfactory.
You can also include C# code directly in a PowerShell script, it that's a help.
I'd ditch the PowerShell ISE (it's no longer a supported product) and move to either VS Code or Visual Studio.
As for a complete list of a .Net class's properties any methods, have a look at the web page for that class. You should find a description of the class and beneath that a "Constructors", "Methods", and "Properties" item.