Gets or sets a value indicating whether validation is performed when the TextBox control is set to validate when a postback occurs.
Assembly: System.Web (in System.Web.dll)
Use the property to determine whether validation is performed on both the client and the server when a TextBox control is set to validate when a postback occurs. Page validation determines whether the input controls associated with a validation control on the page all pass the validation rules specified by the validation control.
By default, a TextBox control does not cause page validation when the control loses focus. To set the TextBox control to validate when a postback occurs, set the property to true and the AutoPostBack property to true.
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.