Not a problem on my development and deployment machines. Just need to remember to set the correct ASP.NET version. Dan Satria Principal Consultant Graha Logica, Inc.

The samples and discussions on client callback ignores one big issue for me. They all POST to the same page; therefore, there is no speed benefit since all Request, Page, and UserControls/CompositeControls initializations are being called. I scrapped my ClientCallBack and use XMLHttpRequest instead and redirect the request to a Generic Handler page. I still need to bypass Request event handler by checking if the request is intended for the the ashx page. Dan Satria Principal Consultant Graha Logica, Inc.

OnInit() { ... this.textbox1.Text = Request.Form[textbox1.UniqueID].ToString(); ... } or bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection) { bool dataChanged = false; if (postDataKey == this.UniqueID) { textbox1.Text = postCollection[textbox1.UniqueID]; Dan Satria Principal Consultant Graha Logica, Inc.