thread problem in textbox control access!

Question

Hye everybody!

I've got a problem with a textbox access. I'm using VS2008, WPF, c#.
I've got two projects in a solution. In one project i update an xml doc. In the other project, in wich my textbox is declared, i have declared a FileSystemWatcher who detect when my xml doc change. When it changes i whant to put a text in my textbox. Unfortunatly it raise a InvalidOperationExeption and write: "The calling thread cannot access this object because a different thread owns it.". I don't know how to solve this problem. Is anyone can help?

Nilanka Dharmadasa · Answer

According to what i understood the text box is owned by one thread while the file system watcher is runing on another thread. You may use a delegate to solve this issue. public class TextBoxHandler { public delegate void DelegateUpdateText( String s); public DelegateUpdateText _DelegateUpdateText ; public TextBoxHandler() { _DelegateUpdateText = new DelegateUpdateText( this .UpdateTextMethod); } public void UpdateTextMethod( string s) { TextBox1.Text = s; } } Now in the file system watcher you can call this delegate '_DelegateUpdateText'. Not the method 'UpdateTextMethod'. TextBoxHandler _obj = new TextBoxHandler (); _obj .Invoke(_obj ._DelegateUpdateText new object [] { File change detected. }); Hope this one will work.