how to use a function in visual basic code example

Example: functions in vb.net

'Function syntax
Private Function addFunc(ByVal [VarName] As [DataType]) As [ReturnDataType] 
	[action]
	Return [ReturnVal]
End Function

'Example function - add 2 numbers together
Private Function addFunc(ByVal a As Integer, ByVal b As Integer) As Integer
	Dim sum As Integer
	sum = a + b
	Return sum
End Function

'NOTE: If the keyword “return” is in the code, then it’s a function.
'If not, it’s a subroutine.