HOW TO view a .NET DLL's dependencies

The simplest though not the most convenient way to view a .NET DLL's dependencies is to use the ildasm.exe tool

Click on the Manifest node to view names of dependent assemblies

The manifest lists the names and versions of all other assemblies that the current assembly depends upon.

If you're adding a reference via NuGet, you can find the dependencies from the information provided for each Package in the Package listing -