WPF

public class NewSet : INotifyPropertyChanged
{
  private bool _isValid;
  public bool IsValidNewSet
  {
    get { return _isValid; }
    set
    {
      if (_isValid != value)
      {
        _isValid = value;
        OnChanged("IsValidNewSet");
      }
    }
  }

  protected virtual void OnChanged(string propertyName)
  {
    PropertyChangedEventHandler handler = propertyChanged;
    if (handler != null)
    {
      handler(this, new PropertyChangedEventArgs(propertyName);
    }
  }
  public event PropertyChangedEventHandler PropertyChanged
  {
    add { propertyChanged += value; }
    remove { propertyChanged -= value; }
  }
  private event PropertyChangedEventHandler propertyChanged;
}

<Button IsEnabled="{Binding IsValidNewSet}" />

Pete O'Hanlon wrote:

if you've got MSDN, Blend 3 RTM is available to download now

Mark Salsbery
Microsoft MVP - Visual C++

amit_1986 wrote:

I tried web browser but that supports only PDF hosting

Collin Jasnoch wrote:

Is it possible to have a template in a library and use it in my app?
If so how do I find it and use it?

Mark Salsbery
Microsoft MVP - Visual C++

pioner wrote:

all of them are written in sync way

pioner wrote:

How can i create proxy for sync wcf service contract manually in SL?

Mark Salsbery
Microsoft MVP - Visual C++

Mark Salsbery wrote:

That means specifying AsyncPattern=true
on your OperationContractAttributes

Michael Sync wrote:

You can just tick "async" when you are generating proxy.

Mark Salsbery
Microsoft MVP - Visual C++

Mark Salsbery wrote:

It doesn't matter if the service operation is implemented sync or async on the server.

Silverlight is on the client end independent of the server, and service operations
MUST be implemented async in Silverlight. That means specifying AsyncPattern=true
on your OperationContractAttributes and implementing your interface methods with the
BeginOperation/EndOperation pattern