If you want to call methods in .NET assemblies in your .NET application, you need to import the assemblies into the target.
To import a private .NET assembly into a .NET target:
Right-click the target in the System Tree and select .NET Assemblies.
The Target Properties dialog box displays the .NET Assemblies tab page.
Click the Browse button to open the Browse for a .NET Assembly dialog box.
Browse to select a private assembly with the .dll, .tlb, .olb, .ocx, or .exe extension and click Open.
To import multiple assemblies, you must select and import them one at a time.
To import a shared .NET assembly into a .NET target:
Right-click the target in the System Tree and select .NET Assemblies.
Click the Add button to open the Import .NET Assembly dialog box.
Select a shared assembly from the list and click OK.
To import multiple assemblies, you must select and import them one at a time. You can also use the Import .NET Assembly dialog box to import recently used assemblies.
For more information about shared and private assemblies, see “Installing assemblies in the global assembly cache”.