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UserControl.IsPostBack Property

Gets a value indicating whether the user control is being loaded in response to a client postback, or if it is being loaded and accessed for the first time.

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

'Declaration
<BrowsableAttribute(False)> _
Public ReadOnly Property IsPostBack As Boolean
'Usage
Dim instance As UserControl 
Dim value As Boolean 

value = instance.IsPostBack

Property Value

Type: System.Boolean
true if the user control is being loaded in response to a client postback; otherwise, false.

The following example adds two key value pairs to the application state associated with a user control if the user control's IsPostBack property returns false. When this condition is met, the code uses the Add method, through the user control's Application property, to add the keys and their values.

If (Not myControl.IsPostBack) Then 
  ' Add new objects to the HttpApplicationState. 
  ' These will be maintained as long as the as the application is active.
  myControl.Application.Add("Author","Shafeeque")                
  myControl.Application.Add("Date",new DateTime(2001,6,21))
  ' Add an object to the cache with expirations 
  ' set to 0.1 minute.
  myControl.Cache.Insert("MyData1", "somevalue", Nothing, DateTime.Now.AddMinutes(0.1), Cache.NoSlidingExpiration)        

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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