Short description of DANSrv 5.1: With the Advosol OPC DA .NET Server Toolkit, OPC DA servers can be developed completely in .NET, either with C# or VB.NET. The OPC DA D(COM) interface is handled in the OPC DA V2.05 and V3.0 compliant generic server and the application specific features are implemented in a .NET assembly. No COM programming is required. The toolkit is well suited to quickly implement simple servers or create high performance OPC servers with over 50000 items.