What Kind of error is this: Additional information: Object reference not set to an instance of an object.

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Hi,
What is the problem with this program:

VB

Private Sub ButtonDecharger_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles ButtonDecharger.Click

       Try

       SpyModem.GetModemMemory(TypeModem, numModem, BytesNumber, memoryModem)
       TextBox1.Text = TypeModem
       TextBox2.Text = numModem

       TextBox4.Text = memoryModem
        Catch ex As Exception
       MsgBox("Erreur ")
       End Try
   End Sub

The Methode "GetModemMemory" is included in a library dll.
When i click in the Button "ButtonDecharger" i get this problem:

"Additional information: Object reference not set to an instance of an object."

All the others méthodes works good, is just this want that doesn't work.Where is the problem?.
Thank you

Posted 31-Jul-13 0:10am

alonetmr

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Syed Shabeer 31-Jul-13 6:14am

My guess is,

Any of these variables TypeModem, numModem, BytesNumber, memoryModem has null value

Have you tried debugging?

♥…ЯҠ…♥ 31-Jul-13 6:16am

Debug the application and trace out the line where this particular error raised?

alonetmr 31-Jul-13 7:44am

Hi,
In fact, these variables:TypeModem, numModem, BytesNumber, memoryModem are not null. The problem comes when I click on the button: ButtonDecharger.
What do you think about this expression?
SpyModem.GetModemMemory(TypeModem, numModem, BytesNumber, memoryModem)
Is just a simple methode. I can't found the problem.
Thanks

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Maciej Los · Answer 1 · 2013-07-31T00:35:00

Solution 1

First of all, read comments to the question.

Next, please, read this: System.NullReferenceException – Object reference not set to an instance of an object. 3 common causes in VB.Net.[^] to find a way how to avoid above error.

Posted 31-Jul-13 0:35am

Maciej Los