Currently we are using the provided dll in a .net 3.5 project. There we get a compiler warning as
"The predefined type 'System.Runtime.CompilerServices.ExtensionAttribute' is defined in multiple assemblies in the global alias; using definition from '<path>\createsend-dotnet.dll <project>"
This is due to ExtensionAttribute is defined in .net 3.5 framework. Is there a dll targeted for .net 3.5 or 4.0 or any other work around to get rid of the warning?