Difference between temp data and view data

Temp data is dictionary derived from temp datadictionary class and stored in session. ViewData is a dictionary of objects that is derived from ViewDataDictionary class and accessible using strings as keys. The basic difference view data is available only current request where as temp data available in two successive requests, after that they are destroyed. In other words when you redirect, “Tempdata” helps to maintain data between those redirects

If we want “TempData” to be read and also available in the subsequent request then after reading we need to call “Keep” method as shown in the code below.

TempData.Keep("MyData");