Well, I am not sure about the issue as you are using very older version i.e. v4.1. But, I think as you are using the version in client profile .NET framework, so you might need Aspose.Cells’s .NET framework client profile version. I am afraid, at that time (when we released v4.1) there was not much concept of client profile version, so, you are getting the issue using the version on VS.NET
2010 client profile .NET framework.
However in latest versions, e.g v5.3.3, 6.0.x, 7.0.0, we provide three types of compiled versions, i.e. .net1.x, .net2.x and .NET framework client profile. So, you should use the dll in net3.5_ClientProfile directory that is used for the console application with Net frame client profile as the target framework of vs.net
2008/2010. For complete reference, please read the readme.txt file in the bin directory.