Most controls, such as TextBoxes and DropDownLists, will work just fine without a viewstate.
I don’t know about any problems of the development process, except for any controls or properties created or modified using the code, it will not be saved without a viewstate, so you will have to recreate / modify them during the postback.
. , viewstate () . , . 300- - , , 99% viewstate. , , datagrids - , , , , viewstate.
Viewstate:
http://msdn.microsoft.com/en-us/library/ms972976.aspx