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Lesson 2: Using Client-Side State Management
ChAPTER 3
You can also disable view state in a Web.config file, by adding the following configuration entry to the <system.web> section.
<configuration> <system.web> <pages enableViewState="false"> </system.web> </configuration>
For a moderately complex form with 20 controls, view state could easily be 10 KB. Across a low-bandwidth connection, that 10 KB would result in about two additional seconds of delay when the user submits the form. That s enough to be very frustrating to users. With more complex forms, view state can be more than 40 KB, which is enough to delay a page response from a user with a typical cable modem by a full second. For that reason, you should do everything you can to minimize the amount of view state data.
Note COmPREssing viEW sTATE DATA
ASP.NET does not provide a way to automatically compress view state data. However, if you enable dynamic HTTP compression by using GZip on your web server, the view state data will be compressed with the rest of the page. If you re determined to compress view state data without compressing the entire webpage, you can override the Page.SavePageStateToPersistenceMedium and Page.LoadPageStateFromPersistenceMedium methods, which serialize and deserialize view state data in each page. Within your overriding methods, use the System.IO.Compression.GZipStream to compress and decompress the view state data.
Reading and Writing Custom View State Data
You can use view state to add and retrieve custom values that you need to persist between page requests. Such a value doesn t have to be part of a control it can be simply something you want to embed in the page to be returned as part of the next request. Adding a value to the view state collection is an efficient and secure way to accomplish this task. Reading and writing these collection values is as straightforward as working with the Dictionary collection. The following code demonstrates simple calls to write data into the view state and retrieve it from the collection.
Sample of Visual Basic Code 'writing to view state Me.ViewState.Add("MyData", "some data value") 'read from view state Dim myData As String = CType(ViewState("MyData"), String)
ChAPTER 3
Handling Events and Managing State
Sample of C# Code //writing to view state this.ViewState.Add("MyData", "some data value"); //read from view state string myData = (string)ViewState["MyData"];
Adding data to the view state is great when you need the information to be passed back to the server as part of the page post. However, the content of the view state is for that page only. The view state does not transfer from one webpage to another (as a cookie does). Therefore, it is useful only for temporarily storing values between requests to a single page. You can store a wide variety of object data inside the view state. You are not limited to just string values as you are with cookies. Instead, any data that can be serialized can be embedded in the view state. This includes classes in the .NET Framework that are marked serializable as well as classes that you write and mark serializable. The following code shows an example of storing a DateTime object instance inside the ViewState without converting it to a string.
Sample of Visual Basic Code ' Check if ViewState object exists, and display it if it does If (Me.ViewState("lastVisit") IsNot Nothing) Then Dim lastVisit As DateTime = CType(Me.ViewState("lastVisit"), DateTime) Label1.Text = lastVisit.ToString() Else Label1.Text = "lastVisit ViewState not defined!" End If ' Define the ViewState object for the next page view Me.ViewState("lastVisit") = DateTime.Now Sample of C# Code // Check if ViewState object exists, and display it if it does if (ViewState["lastVisit"] != null) Label1.Text = ((DateTime)ViewState["lastVisit"]).ToString(); else Label1.Text = "lastVisit ViewState not defined."; // Define the ViewState object for the next page view ViewState["lastVisit"] = DateTime.Now;
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