'Declaration Public ReadOnly Property IsPostbackFromUpload As Boolean
public bool IsPostbackFromUpload {get;}
The WebHtmlEditor control may have one or many instances of a ToolbarUploadButton on the toolbar. This button launches an "upload" dialog which can be used to upload files to the server via a post request. Use this property to check if the postback to the page was due to an "upload" postback, instead of a standard postback (triggered by a button click, for example).
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2