<em><b>url " http://msdn2.microsoft.com/en-us/library/yhzc935f.aspx " only discusion about Web Control, it doesn't discussion about different atttributes between Winform and Webform clearly. who can show clearly and code to me about convert " Control.Text and Control.Tag " in Winform to Webform for system understand!</b></em>
dont check off "do not allow replies to this post" below the input textbox if you want people to answer your question.
winforms is a name given to microsoft's Win32 technology that has been a part of windows since the 1980's. webforms is a name to make people thing that microsoft has invented something other than html. it is a big bloated piece of poo (this is just my opinion of course).
one is a document, and the other is a windowing application. one is formed by writing text and hoping the clients browser draws the document correctly.
.net's windowing system wraps the old Win32 API's into object that are fairly intuitive. in contrast, their "web" technology tries to put an object oriented wrapper around generating a text document. not a bad idea, but they "attempt" to make it look and feel like developing windows applications, when in fact it doesnt feel at all like developing dynamic html nor windows applications. it feels like trying to fit 50 lbs of crap in a 5 lb bag.
Windows' Control, and Web Control are 2 totally different things. they have absolutely nothing in common other than name. web control basically generates some form of html that is collected and sent out with a page that has been requested.