As always, you should be reading the documentation first whenever you have a question. Both the Split function and the String.Split method let you specify the maximum number of parts to split the String into. If you only want to split on the first delimiter then you would specify 2 as the maximum number of parts:
vb.net Code:
  1. Dim parts As String() = myString.Split(New Char() {" "c}, 2)