Gets or sets a value indicating whether the contents of the TextBox control can be changed.
Assembly: System.Web (in System.Web.dll)
[<ThemeableAttribute(false)>] [<BindableAttribute(true)>] abstract ReadOnly : bool with get, set [<ThemeableAttribute(false)>] [<BindableAttribute(true)>] override ReadOnly : bool with get, set
Use the property to specify whether the contents of the TextBox control can be changed. Setting this property to true will prevent users from entering a value or changing the existing value. Note that the user of the TextBox control cannot change this property; only the developer can.
The Text value of a TextBox control with the property set to true is sent to the server when a postback occurs, but the server does no processing for a read-only text box. This prevents a malicious user from changing a Text value that is read-only. The value of the Text property is preserved in the view state between postbacks unless modified by server-side code.
The following code example demonstrates how to use the property to prevent any changes to the text displayed in the TextBox control.
This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.
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.