Generalized type conversion is quite poor and inconsistent (in my opinion) in .NET. However for the Enum / int case, you can use the IConvertible interface, or the Convert associated utility class:

int converted = (int)Convert.ChangeType(MyEnum.MyValue, typeof(int));

or

object converted = Convert.ChangeType(myValue, myExpectedType);

As a site note, this 100% free library here: CodeFluentRuntimeClient has a class named ConvertUtilities that has a bunch of ChangeType method overloads (including a generic one) that are very versatile and useful for type conversion.