Here I am explained with an example , how to built a confirmation box (confirm box) with Yes , No Buttons or Options using AJAX Control Toolkit ModalPopupExtender control Modal Popup in ASP.Net In this article, I will explain how to use ASP.Net AJAX Control Toolkit ConfirmButtonExtender with ModalPopupExtender Modal Popup in order to style the ConfirmButtonExtender dialog and also to make it look same in all browsers. Previous Post I was Explained about the jQuery - Allow Alphanumeric (Alphabets & Numbers) Characters in Textbox using JavaScript , Fileupload show selected file in label when file selected , Check for file size with JavaScript before uploading , Show jQuery UI Dialog Popup Window from Server Side ( Code Behind ) in ASP.Net , How to use the window.open() method By default the Confirmation Box displayed in Internet Explorer as follows In the following example I will make use of a dummy Button w...