This is contrary to the documented functionality of "Gets the string that the user typed into the text box." So, before I can force the value of the Rad Text Box before postback I need to be able to tell if the user has typed in the box.I have written an article on how to use Ajax in ASP. Below Get Set Session Value method is used for both setting and getting the session value.When you click “Get session value” button, the session value is got and placed in textbox.So as we know the page is recreated every time page makes a trip to the server, the data persistence is done with the help of viewstate.Now here the point that are we are going to discuss, even if we set off the View State of some controls like textbox, checkbox etc.. Let’s discuss it in bit detail, whenever a page is submitted or posted back to server, the entire form data is posted to the server as a collection with the request.
You can even enter the value and click “Set Session value” to set the session value. Below call Ajax Method will call the server side method using Ajax.