# SOLIDWORKS PDM Professional API Help

# Using .NET Framework in Stand-alone Applications

If your Visual Studio project uses the primary interop assembly provided with SOLIDWORKS PDM Professional:

- Reference EPDM.Interop.epdm.dll and EPDM.Interop.EPDMResultCode.dll by:
  1. Right-clicking the project name in the Solution Explorer.
  2. Selecting Add Reference.
  3. Selecting Framework in the left-side panel.
  4. Clicking Browse and navigating to the top folder of your SOLIDWORKS PDM Professional installation.
  5. Locating and selecting EPDM.Interop.epdm.dll.
  6. Clicking Open.
  7. Clicking Add.
  8. Repeat step 4.
  9. Locating and selecting EPDM.Interop.EPDMResultCode.dll.
  10. Repeat steps 6 and 7.
  11. Click Close.
- Include the following statements in your code:
  - VB.NET:

    Imports EPDM.Interop.epdm
    Imports EPDM.Interop.EPDM.Interop.EPDMResultCode

  - C#:
    using EPDM.Interop.epdm
    using EPDM.Interop.EPDMResultCode

- Change the version of .NET Framework, select the platform target Any CPU, and for .NET Frameworks 4.5 de-select Prefer 32-bit:
  - VB.NET:
    - In Project > your_project_name Properties... > Application, set Target framework to .NET Framework 4.0 or later (or keep your Visual Studio's default setting)
    - In Project > your_project_name Properties... > Compile > Compile Options:
      - Set Target CPU to AnyCPU
      - If the .NET Framework version is 4.5 or later, de-select Prefer 32-bit
  - C#:
    - In Project > your_project_name Properties... > Application, set Target framework to .NET Framework 4.0 or later (or keep your Visual Studio's default setting)
    - In Project > your_project_name Properties... > Build:
      - Set General > Platform target to Any CPU
      - If the .NET Framework version is 4.5 or later, d e-select Prefer 32-bit
- Prevent failures when calling methods that pass arrays of structures by:

  > 1. Opening the project in Visual Studio.
  > 2. Right-clicking References > EPDM.Interop.epdm in the Solution Explorer and selecting Properties.
  > 3. Setting Embed Interop Types to False in Properties.
  > 4. Right-clicking References > EPDM.Interop.EPDMResultCode in the Solution Explorer and selecting Properties.
  > 5. Setting Embed Interop Types to False in Properties.
  > 6. Initializing arrays of structures in your code to:
  >    - VB.NET: Nothing
  >    - C#: null

#### See Also

Using .NET Framework in Add-in Applications