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Control.ViewState Property

Gets a dictionary of state information that allows you to save and restore the view state of a server control across multiple requests for the same page.

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

protected virtual StateBag ViewState { get; }
/** @property */
protected StateBag get_ViewState ()

protected function get ViewState () : StateBag

Not applicable.

Property Value

An instance of the StateBag class that contains the server control's view-state information.

A server control's view state is the accumulation of all its property values. In order to preserve these values across HTTP requests, ASP.NET server controls use this property, which is an instance of the StateBag class, to store the property values. The values are then passed as a variable to an HTML hidden input element when subsequent requests are processed. For more information about saving server control view state, see ASP.NET State Management.

View state is enabled for all server controls by default, but there are circumstances in which you will want to disable it. For more information, see Developing High-Performance ASP.NET Applications.

For information about dictionaries and how to use them, see Collections and Data Structures.

TopicLocation
How to: Save Values in View StateBuilding ASP .NET Web Applications
How to: Read Values from View StateBuilding ASP .NET Web Applications
How to: Save Values in View StateBuilding ASP .NET Web Applications
How to: Read Values from View StateBuilding ASP .NET Web Applications

The following example demonstrates implementing a Text property that stores and retrieves its value from its control's ViewState property.

private const int defaultFontSize = 3;

// Add property values to view state with set;
// retrieve them from view state with get.
public String Text
{
    get 
    { 
        object o = ViewState["text"]; 
        return (o == null)? String.Empty : (string)o;
    }

    set
    {
        ViewState["Text"] = value;
    }
}


// Add property values to view state with set;
// retrieve them from view state with get.
/** @property 
 */
public String get_Text()
{
    return ((String)(get_ViewState().get_Item("Text")));
} //get_Text

/** @property 
 */
public void set_Text(String value)
{
    get_ViewState().set_Item("Text", value);
} //set_Text

// Add property values to view state with set;
// retrieve them from view state with get.
public function get Text() : String 
{
       return String(ViewState["Text"]);
}

public function set Text(value : String)
{
       ViewState["Text"] = value;
}


Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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