What is Viewstate ? What are the advantages and disadvantages of it view state?

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What is Viewstate ? What are the advantages and disadvantages of it view state?

View state is used to retain the state of the server side objects between post backs.

Advantages :
-Simple for page level data
-Encrypted
-Can be set at the control level.

Disadvantages :
-Overhead in encoding view state values
-Makes a page heavy