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Why I can't Update my class?

Posted By:      Posted Date: September 17, 2010    Points: 0   Category :WPF
Hi I have class who won't update with data but get this error  :”Object reference not set to an instance of an object”. In spite I have declared the object.     public partial class Window1 : Window     {         public Data ClientData { get; set; }         public Data UpdatedData { get; set; }            public Window1()         {             InitializeComponent();             ClientData = new Data();         }                  private void button1_Click_1(object sender, RoutedEventArgs e)         {             if (!string.IsNullOrEmpty(DivisionCode.Text))             {                 if (!string.IsNullOrEmpty(CorporationName.Text))                 {      &nb

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