More about Methods
In this section we look at several other topics pertaining to methods in VB.NET:
Parameter passing
Variable-length parameter lists
Method overloading
Optional parameters
Parameter Passing
Programming languages have different mechanisms for passing parameters. One mechanism is known as call-by-value. This means that the actual data values are copied and passed to the method being called. These copied values are pushed onto the stack, and the called function obtains independent copies of the values. Any changes made to these values will not be propagated back to the calling program. VB.NET supports this mechanism of parameter passing using the ByVal keyword, but VB.NET also supports call-by-reference parameters.
Some terminology ...
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