how to preview the information before submitting using asp.net

What do you mean by preview?

i need to preview the data before submitting using asp.net here preview means to display the data for verification before submitting the button

for eg.,  thing done in aspsnippet forum there is option in preview, to display the typed data..

There is no ready code available for that. You can use ModalPopupExtender for Preview data

using AJAx tool kit is that possible..

Yes you can do as following

1. On Submit button copy data from textbox to labels inside modal popup and show modal popup

2. In modal popup add another submit button that will save data to database