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PageStatePersister.Save Method

Overridden by derived classes to serialize persisted state information when a Page object is unloaded from memory.

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

public abstract void Save()

Classes that derive from the PageStatePersister class implement the Save method to persist the contents of the ViewState and ControlState properties to a persistence medium.

The following code example demonstrates how a class that derives from the PageStatePersister class implements the Save method to persist view state to a persistence medium. The StreamPageStatePersister uses an IStateFormatter object to serialize the contents of the ViewState property and ControlState property. This code example is part of a larger example provided for the PageStatePersister class.

// 
// Persist any ViewState and ControlState. 
// 
public override void Save()
{

    if (ViewState != null || ControlState != null)
    {
        if (Page.Session != null)
        {
            Stream stateStream = GetSecureStream();

            StreamWriter writer = new StreamWriter(stateStream);

            IStateFormatter formatter = this.StateFormatter;
            Pair statePair = new Pair(ViewState, ControlState);

            // Serialize the statePair object to a string. 
            string serializedState = formatter.Serialize(statePair);

            writer.Write(serializedState);
            writer.Close();
            stateStream.Close();
        }
        else 
            throw new InvalidOperationException("Session needed for StreamPageStatePersister.");
    }
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

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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