Deletage and Events in C#/VB.Net:Object reference not set to an instan

[uticket]

Hi, need your help!

This is a 3-tier application. The business logic layer uses C# function to synch with server, it raises events to notify the UI to report the status of the application. UI is creating a status form in VB.Net.

This is a simple delegate and events function, but when I run the program, I keep receiving error:
Object reference not set to an instance of an object.

Business Logic:
project Synchronization class: clsSynch funtion: Synch()

public delegate void Synch_Status_Delegate(string msg);
public event Synch_Status_Delegate SynStatus;
.......
SynStatus("Start Synch...");
........

UI: In project Main, class clsmain:

Dim frmStatusForm As clsSynchStatus
frmStatusForm.Show();

In Project Main, class clsSynchStatus:

Private WithEvents m_clsSynch As New clsSynch

Public Sub m_clsSynch_SynStatus(ByVal msg As String) Handles m_clsSynch.SynStatus
''put the message in the status bar on the form

Try
Me.lblStatus.Text = msg
Me.Refresh()
Catch ex As Exception
ExceptionManager.Publish(ex)
End Try
End Sub

Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Synch()
End Sub

Any hints will be appreciated! Let me know if you need further information

Thanks!

 

[JohnYingling]

Object reference not set to an instance of an object.

on what line of code?

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[uticket]

The error was on this line of code when the business object raises events:

SynStatus("Start Synch...");

Thanks!

 

[uticket]

Any body can help?

Thanks!

 

[obislavu]

I don't see where how the event is raised but I think you should have something like that:

if (SynStatus != null)
SynStatus(this, new EventArgs());

-obislavu-