What You Mean by ViewState:
Viewstate is a built-in structure for automatically retaining values amongst the multiple requests for the same page. The viewstate is internally maintained as a hidden field on the page but is hashed, providing greater security than developer-implemented hidden fields do.
Performance for viewstate vary according to User controls:
Performance of viewstate varies depending on the type of server control to which it is applied. Label, TextBox, CheckBox, RadioButton, and HyperLink are server controls that perform well with ViewState. DropDownList, ListBox, DataGrid, and DataList suffer from poor performance because of their size and the large amounts of data making roundtrips to the server.
Benefits and Limitation of using Viewstate for State management:
Benifits of Using ViewState:
a).No server resources are required because state is in a structure in the page code.
b).Simplicity.
c).States are retained automatically.
d).The values in view state are hashed, compressed, and encoded, thus representing
e).A higher state of security than hidden fields.
f).View state is good for caching data in Web frame configurations because the
data is cached on the client.
Limitation of using Viewstate:-
a).Page loading and posting performance decreases when large values are
stored because view state is stored in the page.
b).Although view state stores data in a hashed format, it can still be tampered
because it is stored in a hidden field on the page. The information in the
hidden field can also be seen if the page output source is viewed directly,
creating a potential security risk.
Below is sample of storing values in view state.
this.ViewState["EnterTime"] = DateTime.Now.ToString()
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