How to use Stacktrace to return Error Line Number in vb.net

Generating line numbers in exception stack traces is a built-in feature for the CLR. You do however have to provide the information it needs to map a code address to a line number. Switch to the Release configuration of your project. Project + Properties, Compile tab, Advanced Compile Options. Change the "Generate debug info" setting from pdb-only to Full. Deploy the .pdb files along with your program.

Beware that the line number you get is always an estimate so do not blindly trust what you see. The mapping is imperfect due to the jitter optimizer inlining methods and otherwise moving code around to make the program run faster.

I have adapted an example from other forum, in my case, I wasn't getting the line number where the error was caused, so I started playing around and found a solution, the code is as follows:

Public Class Form1
    Private Sub a2()
        Dim b As Integer = 0
        Dim a As Integer = 1 / b
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
        Try
            a2()
        Catch ex As Exception
            Dim st As New StackTrace(True)
            st = New StackTrace(ex, True)
            MessageBox.Show("Line: " & st.GetFrame(0).GetFileLineNumber().ToString, "Error")
        End Try
    End Sub
End Class

In this example, line 4 will trigger the error exception, but once I applied the principle in a real life application, line was 0, so I started playing with the index in the GetFrame property, it ranges from 0 to 4, when I put 4 in the object, EUREKA, I got the line number causing the problem.