i do my final project IDE for HTML.In that i decided to create a environment which is in power point.that is if i code HTML in rich text box i save it in a file and i have a web browser in the same page in bottom which shows the design of web-page simultaneously.in that i need to create a webbrowser in side which shows the thumnanil of the webpage.if i click a button of next for designing next page i need a another webbrowser in side like powerpoint

You may not be able to do that using VB.NET , rather display the design on request and do not try to display both of the code and design together.