Using TempData, Peek And Keep In ASP.NET MVC

•  If you set value for TempData and do not read the value then the data will be available for next request.

• If you set value for TempData and read in View then the data will be deleted or will be null.
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• If you read TempData in the first request and want to keep the value for the next request then use 'Keep' Method.
• If you read the TempData using 'Peek' then value persists for the next request also. 

You can use Peek() when you always want to hold/prevent the value for another request. You can use Keep() when prevent/hold the value depends on additional logic.