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UserControl.SaveViewState Method

Saves any user control view-state changes that have occurred since the last page postback.

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

protected override Object SaveViewState()

Return Value

Type: System.Object
Returns the user control's current view state. If there is no view state associated with the control, it returns null.

In general, you do not need to call this method. However, if you store custom information in view state, you can override this method to do so.

The following example demonstrates a user control that manages its view state using the LoadViewState and SaveViewState methods.

   public string UserText
   {
	   get
	   {
		   return (string)ViewState["usertext"];
	   }
	   set
	   {
		   ViewState["usertext"] = value;
	   }
   }
   public string PasswordText
   {
	   get
	   {
		   return (string)ViewState["passwordtext"];
	   }
	   set
	   {
		   ViewState["passwordtext"] = value;
	   }
   }

   [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")] 
   protected override void LoadViewState(object savedState) 
   {
	   object[] totalState = null;	   
	   if (savedState != null)
	   {
		   totalState = (object[])savedState;
		   if (totalState.Length != 3)
		   {
			   // Throw an appropriate exception.
		   }
		   // Load base state. 
		   base.LoadViewState(totalState[0]);
		   // Load extra information specific to this control. 
		   if (totalState != null && totalState[1] != null && totalState[2] != null)
		   {
			   UserText = (string)totalState[1];
			   PasswordText = (string)totalState[2];
		   }
	   }

   }

   [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")] 
   protected override object SaveViewState()
   {
	   object baseState = base.SaveViewState();
	   object[] totalState = new object[3];
	   totalState[0] = baseState;
	   totalState[1] = user.Text;
	   totalState[2] = password.Text;
	   return totalState;
   }

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

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