Updated [11/08/2008]:
This update has the explanatory remarks and corrects the MEAN() function in the demo that was not working properly. Numerous remarks were also incorporated in the two programs [MEAN.APL and FORM.CS] to highlight features and add explanations.
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This download is a .zip file containing a C# Windows forms project which calls VisualAPL functions in a VisualAPL .Net assembly. You should be able to follow the references and the calls to the APL functions in Visual APL. To install, unzip the file and open the project/solution CS_APL_IDIOM_MEAN_OF_VECTOR_OF_NUMBERS.sln. The solution must be built prior to running or debugging..
Note that the VisualAPL Cielo script is not relevant to the project, but is included to demonstrate VisualAPL for C# persons.