I'm happy to announce we now have C# API for LDTP. Tested the API set with VB.NET and PowerShell. Get latest LDTP binary from here Credit: John Yingjun Li, who have done the most of work creating C# client, verifying with Linux LDTP, creating VB.NET test app. API's tested against Cobra (Windows LDTP) and LDTP (Linux version, remotely though). Include Ldtp.dll and CookComputing.XmlRpcV2.dll into your project as dependency. Check C# client and example source.