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How to send button down to a button of another WPF C# application

I wrote an WPF C# application (called slave application)  that have a button. When click on it, it will perform a task.
Now I launch 10 copies of this slave application.
I will like to be able to create another C# application (called master application) with a buttton. When click on this button in the master application , it will as if I have manually clicked on each of the button of the 10 copies of the slave application.

Did anyone have any idea how I can achieve that?
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tommym121
Asked:
tommym121
2 Solutions
 
Nathan BoveSoftware EngineerCommented:
1)  Ensure that the method responsible for handling the button click in the "Slave" application is marked as public.

2) In the event handler of the button click in the "Master" application, iterate over each "Slave" application instance and call the method responsible for handling the button click.
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tommym121Author Commented:
Any code example to show how this to be done.
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Bob LearnedCommented:
I would suggest something more along the lines of IPC (Interprocess Communication).  You could use a TCP/IP socket, .NET remoting, or a named pipe.

Simple Inter-Process Communication In VB.Net
http://anoriginalidea.wordpress.com/2007/08/09/simple-inter-process-communication-in-vbnet/

.NET 3.5 Adds Named Pipes Support
http://www.switchonthecode.com/tutorials/dotnet-35-adds-named-pipes-support

Socket Send and Receive [C#]
http://www.csharp-examples.net/socket-send-receive/
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apeterCommented:
If slave and master application are in the same system and named pipe is the best choice.
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