.NET Framework Class Library
IPostBackDataHandler..::.LoadPostData Method

When implemented by a class, processes postback data for an ASP.NET server control.

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

Visual Basic (Declaration)
Function LoadPostData ( _
    postDataKey As String, _
    postCollection As NameValueCollection _
) As Boolean
Visual Basic (Usage)
Dim instance As IPostBackDataHandler
Dim postDataKey As String
Dim postCollection As NameValueCollection
Dim returnValue As Boolean

returnValue = instance.LoadPostData(postDataKey, _
    postCollection)
C#
bool LoadPostData(
    string postDataKey,
    NameValueCollection postCollection
)
Visual C++
bool LoadPostData(
    String^ postDataKey, 
    NameValueCollection^ postCollection
)
JScript
function LoadPostData(
    postDataKey : String, 
    postCollection : NameValueCollection
) : boolean

Parameters

postDataKey
Type: System..::.String
The key identifier for the control.
postCollection
Type: System.Collections.Specialized..::.NameValueCollection
The collection of all incoming name values.

Return Value

Type: System..::.Boolean
true if the server control's state changes as a result of the postback; otherwise, false.
Remarks

The ASP.NET page framework tracks all the server controls that return true to this method call, and then invokes the RaisePostDataChangedEvent method on those controls.

Examples

The following code example demonstrates a server control that implements a version of the LoadPostData method.

Visual Basic
Public Overridable Function LoadPostData(postDataKey As String, _
   postCollection As NameValueCollection) As Boolean

    Dim presentValue As String = Text
    Dim postedValue As String = postCollection(postDataKey)

    If (presentValue Is Nothing) OrElse (Not presentValue.Equals(postedValue)) Then 
        Text = postedValue
        Return True
    End If
    Return False
End Function

C#
public virtual bool LoadPostData(string postDataKey,
   NameValueCollection postCollection) {

   String presentValue = Text;
   String postedValue = postCollection[postDataKey];

   if (presentValue == null || !presentValue.Equals(postedValue)){
      Text = postedValue;
      return true;
   }
   return false;
}

Platforms

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.
Version Information

.NET Framework

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

Reference

Other Resources

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