How to Make a C# DLL COM-Visible for VB6?

Convert a C# DLL to a COM Interop Component for VB6 Applications

Question: How can I transform a basic C# DLL into a COM interop DLL compatible with VB6 applications?

Answer: Creating a COM interop DLL using C# is relatively straightforward.

Creating the C# DLL:

• Create a C# class project and define an interface for properties, methods, and events.
• Assign GUID attributes to the class and interfaces as per MSDN guidelines.
• Enable "Make assembly COM-Visible" in Project Properties > Application > Assembly Information.
• Set "Platform target" to x86 in Project Properties > Build.

Registering the DLL for Development:

• Register the DLL automatically by enabling "Register for COM Interop" in Project Properties > Build.

• Alternatively, manually register it using RegAsm.exe:

  • Copy the DLL to the desired location.
  • Run the command RegAsm.exe -tlb -codebase mydll.dll from an administrator command shell, replacing mydll.dll with the DLL's name.

Using InstallShield for DLL Installation:

• Create a new Component in InstallShield.
• Set ".NET COM Interop" to Yes.
• Add the DLL file to the Component's Files section.
• Right-click the DLL file and select "Set Key File."
• Add the TLB file to the Files section.
• Enable "Self-Register" for the TLB file.
• Ensure the correct .Net Framework version is installed on the target PC.

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