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IPostBackDataHandler.LoadPostData Method

.NET Framework 4.5

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)

bool LoadPostData(
	string postDataKey,
	NameValueCollection postCollection
)

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.

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;
}

Version Information

.NET Framework

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

Platforms

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.

Reference

IPostBackDataHandler Interface

System.Web.UI Namespace

Other Resources

Server Event Handling in ASP.NET Web Forms Pages

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