How to call a Afaria API service on click of a button in Visual studio 2010?

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C#

Hi,

I have created a windows form application. With one combo box, one button and one textbox.
The combo box consists of list of Afaria API's names.
Now based on combo box selection, when i click the button (named as retrive), i should be able to display all the service information in the text box.

Am using the following link to get list of Afaria API names:

http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/a0138e96-8606-3110-86bd-ca88a91f110f?QuickLink=index&overridelayout=true&58695023104234

For my example, am using only two API's i.e Channel and Devices.

show how can i call the API on click of a button in C#?