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Page.EnableViewState Property

Gets or sets a value indicating whether the page maintains its view state, and the view state of any server controls it contains, when the current page request ends.

Namespace:  System.Web.UI
Assembly:  System.Web (in System.Web.dll)

[BrowsableAttribute(false)]
public override bool EnableViewState { get; set; }

Property Value

Type: System.Boolean
true if the page maintains its view state; otherwise, false. The default is true.

For information about why you might want to disable view state, see Control.EnableViewState.

Even if EnableViewState is false, the page might contain a hidden view state field that is used by ASP.NET to detect a postback.

The following code example sets the EnableViewState property to false when the page is loaded. This disables view state for the Page object, meaning that neither view-state information for the page nor any controls contained by the page are saved.

Security noteSecurity Note

This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.

public class WebPage : Page
{
   private MyForm myFormObj;
   private Label label1;
   private Label label2;
   private TextBox textBoxObj;
   private Button buttonObj;

   public WebPage()
   {
      Page.Init += new System.EventHandler(Page_Init);
   }

   private void Page_Load(object sender, System.EventArgs e)
   {
      // Comment the following line to maintain page view state.
      Page.EnableViewState = false;
      myFormObj.Method = "post";
      Controls.Add(myFormObj);
      textBoxObj.Text = "Welcome to .NET";

      label1.Text = "Enter a name";
      buttonObj.Text = "ClickMe";
      buttonObj.Click += new EventHandler(Button_Click);
      myFormObj.Controls.Add(label1);
      myFormObj.Controls.Add(textBoxObj);
      myFormObj.Controls.Add(buttonObj);
      myFormObj.Controls.Add(label2);
   }
   private void Button_Click(object sender, EventArgs e)
   {
      String temp = "<br>Name is " + textBoxObj.Text + "<br>";
      temp += "Saved content of previous page is " + ViewState["name"] as String;
      label2.Text = temp;
   }
   protected override void LoadViewState(object viewState)
   {
      if(viewState != null)
         base.LoadViewState(viewState);
   }
   protected override object SaveViewState()
   {
      ViewState["name"] = textBoxObj.Text;
      return base.SaveViewState();
   }
   private void Page_Init(object sender, EventArgs e)
   {
      this.Load += new System.EventHandler(this.Page_Load);

      myFormObj = new MyForm();
      label1 = new Label();
      label2 = new Label();
      textBoxObj = new TextBox();
      buttonObj = new Button();
   }
};

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
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