How can I call a this Function that returns a RadioButtom name in a GroupBox

[ebellounisoft]

Private Function WhatRadioIsSelected(ByVal grp As GroupBox) As String
        Dim rbtn As RadioButton
        Dim rbtnName As String = String.Empty
        Try
            Dim ctl As Control
            For Each ctl In grp.Controls
                If TypeOf ctl Is RadioButton Then
                    rbtn = DirectCast(ctl, RadioButton)
                    If rbtn.Checked Then
                        rbtnName = rbtn.Name
                        Exit For
                    End If
                End If
            Next
        Catch ex As Exception
            Dim stackframe As New Diagnostics.StackFrame(1)
            Throw New Exception("An error occurred in routine, '" & stackframe.GetMethod.ReflectedType.Name & "." & System.Reflection.MethodInfo.GetCurrentMethod.Name & "'." & Environment.NewLine & "  Message was: '" & ex.Message & "'")
        End Try
        Return rbtnName
    End Function