Home / Community & Support / Developer Productivity Tools Forums / Silverlight > NumericUpDown > Calling BindinExpression.UpdateSource() doesn't update bound property

• Scott

  Posted on Mar 9, 2011 (permalink)

  I have a few RadNumericUpDown controls bound in TwoWay mode to properties. I have the following code that does get called when the KeyUp event occurs:
  

  private void KeyUp(object sender, KeyEventArgs e)

  {

      FrameworkElement fe = (FrameworkElement) sender;

      BindingExpression exp;

      if (fe is TextBox)

      {

          exp = fe.GetBindingExpression(TextBox.TextProperty);

      }

      else if (fe is RadNumericUpDown)

      {

          exp = fe.GetBindingExpression(RadRangeBase.ValueProperty);

      }

      else

      {

          throw new Exception("Invalid type");

      }

        

      exp.UpdateSource();

  }

  
  If I use this code on a TextBox the source is updated with the correct value but if I use a RadComboBox it does not update the source. What am I doing wrong?
  
  What I'm trying to accomplish is to update all my bindings whenever a change is made to the RadNumericUpDown control without having to lose focus on the control. Pressing the up/down buttons in the control do update my bindings but typing numbers in the control do not until the contolr loses focus.

  Reply

• Scott

  Posted on Mar 9, 2011 (permalink)

  I figured it out. I just needed to change the UpdateValueEvent like so
  

  UpDown1.UpdateValueEvent = UpdateValueEvent.PropertyChanged;

  Thanks for listening to me ramble :-)

  Reply

• sivakanth

  Posted on Apr 12, 2011 (permalink)

  Hi Scott ,
                How to Update RadcomboBox value without losing Focus?
  can u give me details..my mail id is s.sivakanth@gmail.com

  Reply

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