Hello
Can I dynamically create controls in Silverlight without a postback to the server (even an asynchronous one). Does silverlight drag-n-drop requires postback?
I'm asking this because I've an asp.net application where I dynamically create/delete lots of controls. So after the postback I'm getting error with view state stating that the control tree doesn't match the view state tree.
Can I avoid such problems in Silverlight?
Yes you can add controls dynamically to pages, without a round-trip to the server.
Drag-drop is also executed client-side.
Think of Silverlight as more like a desktop app, that talks to the server only to get/save data.
Adding controls dynamically in Silverlight is as simple as newing the appropriate control class and inserting it in the render tree (e.g. by adding it to a parent control).
everything done in a silverlight control/application happen on the client. web service calls if any happen asynchronously. thats on of the advantages of using silverlight
The vast majority of what goes on in Silverlight involves no postback. In fact, I'd say Silverlight represents a completely different mindset. Whenever there IS a postback from Silverlight, it will almost always be asynchronous, and there is no "view state" that the server needs to worry about. In my opinion, it makes ASP.NET look like a joke when it comes to writing web applications.
Here is an example: http://asd.murven.com/blog/post/2009/10/16/Silverlight-Adding-controls-dynamically.aspx.
However, I would not suggest switching to Silverlight just to kill this bug. Only if you have a real need for a client-like application instead of a real web application. ASP.NET is suitable for dynamically creating controls as well. Please remember to initialize the control on the server during each postback. If this doesn't help, I would suggest you to submit a description of your problem with some code to help us solve it with you.
Br. Morten