Explanation * AssemblyDelaySignAttribute Specifies that the assembly is not fully signed when created. * The following code example shows the use of the AssemblyDelaySignAttribute attribute with the AssemblyKeyFileAttribute. using System; using System.Reflection; [assembly:AssemblyKeyFileAttribute("TestPublicKey.snk")] [assembly:AssemblyDelaySignAttribute(true)] namespace DelaySign { public class Test { } } Reference: http://msdn.microsoft.com/en-us/library/t07a3dye(v=vs.110).aspx