ViewState

Question

Hi Does ViewState affect performance ? What is the ideal size of a ViewState ? How can you compress a viewstate ?

Jignesh Trivedi · Answer

hi Yes View state effect performance. Size of view state depend upon what the data store in it and also no of control on page. View state is already compressed and encoded so i think no need to do this. hope this help.

Senthilkumar · Answer

Hi Does ViewState affect performance ? Yes. It needs to load the data across the post backs and lot of loads to the server as well as it needs to render into the web page. The size of the view state will be depends on the data and it will be encrypted and descrypted every time when submit to the server. It will have the encrypted data format in the hidden control. The size of the page will be more. It will take time to render on the web page. What is the ideal size of a ViewState ? To maximize performance each page should be judged on whether it needs ViewState information. If no ViewState is needed in the page or any of its controls set the EnableViewState property of the page or control to false. Also remove the runat=Server attribute from the form tag. If this tag isn't removed the page itself passes on about 20 bytes of information to the ViewState. If ViewState is needed make sure it is enabled only for controls that are really going to use it. Some controls such as Label and TextBox do not have a large ViewState footprint. But DataGrids and DataRepeaters store all of their data in ViewState by default making the page's output potentially very large. If you want to use one of these larger footprint controls you can reduce its size by setting the EnableViewState property to false. This will force the DataGrid to go to the datasource for its data with each request which of course impacts whatever datasource you're using. But it will greatly reduce the size of the HTML stream sent to the client. For more info: http://www.4guysfromrolla.com/articles/091510-1.aspx How can you compress a viewstate ? The compression functionality in GZipStream is exposed as a stream. In the code displayed below we will create a class called ViewStateCompressor that contains two methods : Compress(byte[] array) - Accepts a decompressed bytearray compresses it and returns a compressed bytearray. Decompress(byte[] array) – Accepts compressed bytearray decompresses it and returns a decompressed bytearray. http://www.dotnetcurry.com/ShowArticle.aspx?ID=67 http://www.codeproject.com/Articles/14733/ViewState-Compression Drawbacks: - Increase the page payload (when you have grid with many rows then every thing has to be loaded and retain again with serialize and deserilize) - Additional overhead while serialize and deserialize. - Increase the memory allocation on the server. -It can be tempered by the hackers if they know the format.

Satyapriya Nayak · Answer

Hi Arun Please refer the below links http://www.c-sharpcorner.com/UploadFile/051e29/introducing-viewstate-in-Asp-Net/ http://www.w3schools.com/aspnet/aspnet_viewstate.asp http://asp.net-tutorials.com/state/viewstate/ Thanks