Class > Method > Error :(

[PROKA]

Here is my code :

   Public Class Operatie

       Public Function Add(ByVal ParamArray x() As Integer) As Integer
           Dim i As Integer
           Dim sum As Integer = 0
           For Each i In x
               sum += i
           Next

           Return sum
       End Function
  End Class

 Dim proka As Operatie

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
       MessageBox.Show(proka.Add(2, 3).ToString)
   End Sub

 

 

 

and here is my error when I click that button :

An unhandled exception of type 'System.NullReferenceException' occurred in Learn VB.NET 2.0 Class 3.exe
Additional information: Object reference not set to an instance of an object.

[JumpsInLava]

Dim proka As New Operatie

[Nerseus]

Or make function Add "Shared" and then call it with:

MessageBox.Show(Operatie.Add(2, 3).ToString)

 

-Nerseus

[Arch4ngel]

Your error is caused by this :

Operatie value is NULL.

 

And you can't reference .Add of an null object ya ?

[PROKA]

Thanks Guys