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HtmlSelect.LoadPostData Method

Processes the postback data for the HtmlSelect control.

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

protected virtual bool LoadPostData(
	string postDataKey,
	NameValueCollection postCollection


Type: System.String

The key identifier for the control.

Type: System.Collections.Specialized.NameValueCollection

The collection of all incoming name values.

Return Value

Type: System.Boolean
true if the HtmlSelect control's state has changed as a result of a postback; otherwise, false.


The SelectedIndex property was set to a value greater than the number of items in the HtmlSelect control or less than -1.

The LoadPostData method checks whether the postback data of the HtmlSelect control is different from its previous value, and if so, returns true. If the HtmlSelect control's Multiple property is false, indicating a single-selection HtmlSelect control, then the LoadPostData method checks the SelectedIndex property. If the HtmlSelect control's Multiple property is true, indicating a multiple-selection HtmlSelect control, then the LoadPostData method checks the SelectedIndices property.

The LoadPostData method is used primarily by control developers extending the functionality of the HtmlSelect control.

.NET Framework

Supported in: 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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