867c4b58_VB_Net___Modifiers__Modifier
[S.N] 6 [Description] Specifies that an argument is passed in such a way that the called procedure or property cannot change the value of a variable underlying the argument in the calling code. It is used under the contexts of: Declare Statement Function Statement Operator Statement Property Statement Sub Statement [Modifier] 
ByVal
VB.Net - Modifiers