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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)
[BrowsableAttribute(false)]
protected virtual StateBag ViewState { get; }

Property Value

Type: System.Web.UI.StateBag
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 Overview.

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 ASP.NET Performance Overview.

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.

        // 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;
            }
        }

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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