invoke Matlab object's (directory) method from .Net

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I defined a class with a bunch of methods stored in a method directory. I can instantiate the class and invoke its methods within matlab. However, if I try to do the same from .NET/COM I get this error messages:

"??? Reference to non-existent field 'test'.\n\n"

Here test is the method.

My class is derived from handle and I have tried both possibilities: method defined in class file and directory method. Neither works!

Any feedback would be very much appreciated. Many thanks.

PS:

C# code:

MLApp.MLApp matlab = new MLApp.MLApp();

matlab.Execute("clear;");
matlab.Execute("Object = Class1();");
string test = matlab.Execute("Object.test()");

Working matlab code:

clear;
Object = Class1();
Object.test()