Nivell,
Please check the following examples:
7. Persist Uploaded File through Postback A sample demonstrates how to persist the selected files during page postbacks. Ajax Uploader can hold an object temporarily and you can save it anytime you want.
11. Ajax based user profile User profile is the primary part of a community application. Ever wanted to allow users update the images of their profiles using AJAX without reloading the page? Check it now!
The source code of thease examples can be found in the download package.
asp.net Chat http://cutesoft.net/ASP.NET+Chat/default.aspx
Web Messenger: http://cutesoft.net/Web-Messenger/default.aspx
asp.net wysiwyg editor: http://cutesoft.net/ASP.NET+WYSIWYG+Editor/default.aspx
asp wysiwyg html editor: http://cutesoft.net/ASP
asp.net Image Gallery: http://cutesoft.net/ASP.NET+Image+Gallery/default.aspx
Live Support: http://cutesoft.net/live-support/default.aspx