The source code of Xceed Workbookss for .NET is available by purchasing a Blueprint subscription, which gives the complete C# source code to the Xceed.Wokbooks.NET.dll as well as all the files required in order to compile and build this .NET assembly. The same applies for the .NET5+ assemblies. The source code is delivered in installation kits separate from the main package, and is provided only to registered users that have purchased a Blueprint subscription.

The source code made available through a Blueprint subscription contains valuable and proprietary trade secrets of Xceed Software Inc. and its use is strictly subject to the terms and conditions of the XCEED SOFTWARE LICENSE AGREEMENT included with the source code.

Specifically what source code is included and what is not included

Only the source code required to build the DLL assemblies mentioned above is included. These DLLs are the only files registered users are permitted (and need) to distribute with their applications.

Note: All source code comments and remarks from the original development source code have been preserved in the source code provided through a Blueprint subscription to increase its value for educational purposes.

Usage instructions and recommendations

To use the source code provided through a Blueprint subscription, simply run the Xceed.Workbooks.NET.Blueprint.exe self-extracting zip file to unzip the source code files into the suggested folder or the folder of your choice and then load the Xceed.Workbooks.NET.Blueprint.sln file into Visual Studio.NET and build the project. 

The resulting DLL does not have a "strong name" embedded into it, so it is not possible to register it in the .NET Global Cache. Please refer to the Microsoft .NET documentation on how to assign a strong name. 

If you wish to distribute the assemblies you have built from the Blueprint subscription source code, it is strongly recommended that you rename the assemblies, for example, by adding "Custom" to their name, in order to make them identifiable to both you and Xceed as corrected or modified versions. Remember that distribution of Blueprint source code (whether compiled or in source code form) is strictly subject to the terms and conditions of the license agreement.