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Access forms by a thread

delegate void WriteStatusCallback(string statusMsg); 
 
public void WriteStatus(string statusMsg)
{
    if (InvokeRequired)
    {
        Invoke(new WriteStatusCallback(WriteStatus), new Object[] { statusMsg });
    }
    else
    {
        // Access Windows forms control
    }
}

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Accessing Windows forms controls needs special handling by the Invoke() function.