IndexOutOfRangeException in VB.NET

Answer 1

Turn on debug build and that will probably give you the possibility to add breakpoints and will also give you som row numbers at the stact trace.

Your problem is that you are not handling if p.Length = 0, that occurs if there is no process with the name "FirstLine".

Have you also renamed your process / application ?

Answer 2

Dim prc As Process = p(0) is your problem as it is in the else statements where the the array length can be anything but 1 (0 for instance).

when the length is 0 it will give you the IndexOutOfRange when you try to access the first element.