How can I declare a temporary variable to hold the name of a subroutine in a vb codebehind page

I have 4 subroutines in a vb codebehind page, and the only difference is that they end with a number 1 - 4
i.e. testSub1, testSub2, testSub3, testSub4
 
How can I nest through them with a
for i = 1 to 4
Dim testSubN as subroutine = "testSub" & i & ()
testsubN()
next
 
thanks
This doesn't work
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