The difference between an empty piece of a server control client and how to refresh a page without database data staying on the page

 difference: the server-side control will have a runat= "Server" property, 
 in order to be able to modify it in the background, 
 that is, in the CS code can modify its settings. 
 You do the test, you put an HTML control in the CS code is not referenced in the name of the control 
 and then you add an HTML control runat= "Server" in the CS code can reference the control 
 essentially ASP. After parsing, return to the foreground or HTML control 
 you build a page to put a asp:textbox up 
 and then run the page, and then view the page source file 
 You'll find that the server control on it becomes the HTML inupt type= "button" 
 
 As you say, the view state should say this: 
 because the HTTP connection is stateless, each page request cannot log information from the last requested page. 
 then you want to save the value of the control on the last Request page, that is, after the page refresh, fill in the value of the same, for example, in the textbox filled with a ' a ', after the page refresh or ' a ',. NET Framework to implement this mechanism, the ViewState view state is used to hold the values of these controls, 
 So what is the value of all the controls there? You can run your program, and then view the source file in the page, you can see a input type= "hidden" name= "__viewstate" The label, this is what you call "view", it is serialized by the server, The server then deserializes the values of the hidden fields and then assigns the values to the controls again, so that the page refreshes and records the values of all the controls at the time of the last request. The server control will be saved by default ViewState has a property (EnableViewState) can be set, set to Flase will not save, the page refreshed, the value is gone, You can do a test put a TextBox set to EnableViewState to False, and then enter a value, and then use the button to refresh the page, then the textbox will be empty, because there is no view state record to the last value you entered. 
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The difference between an empty piece of a server control client and how to refresh a page without database data remaining on the page