The HtmlTextArea control allows programmatic access to the HTML <textarea> element on the server and Web developers can use it to create a multiline text boxes on a Web page. The height and width of a multiple text boxes can be controlled by setting the Rows and Cols properties. Web developer can assign a name to the control by setting the Name property. If he/she wants to specify the text in the text box, he/she should use the Value property. The class provides a ServerChange event that allows Web developer to perform a custom set of instructions every time the value of the text box changes between posts to the server. This event is commonly used for data validation.
Assembly: System.Web (in System.Web.dll)
|Property||Description||Supported in .NET version|
|Adapter||This property gets the browser-specific adapter for the control. If the target browser does not require an adapter, returns a null reference (Nothing in VB.NET). The property returns the ControlAdapter object that renders the control on the requesting device or browser’s screen.||2.0, 3.0, 3.5, 4.0|
|Software developer can use this property to set or get the application-relative path to the page or user control that contains the current control. If the web page is installed in https://www.somesite.com/apps/application1 the property will return “~/application1”.||2.0, 3.0, 3.5, 4.0|
|Attributes||Web developer can use this property to get a collection of all attribute name and value pairs expressed on a server control tag within the ASP.NET page. Using this property Web developer accesses the attributes of the HTML server control which are stored in Control.ViewState property. HTML attributes are treated by the .NET Framework as properties on the HTML server control to which they belong.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|BindingContainer||Software developer can’t use this property directly from his/her code, because it supports the .NET Framework infrastructure. The property contains a reference to the Control object which contains data-binding information for the current control.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|ChildControlsCreated||Gets a true value that indicates whether the server control’s child controls have been created.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|ClientID||Returns the server control identifier generated by ASP.NET. The ClientID value is generated by concatenating the ID value of the control and the UniqueID value of its parent control. If the ID value of the control is not specified, an automatically generated value is used. Each part of the generated ID is separated by an underscore character (_).||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|ClientIDSeparator||The ClientID value is generated by concatenating the ID value of the control and the UniqueID value of its parent control. Each part of the generated ID property is separated by the ClientIDSeparator property value. The value always returns an underscore (_).||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|Cols||This property gets or sets the width (in characters) of the HtmlTextArea control. Its default value is -1, which indicates that this property is not set. If the end user enters text that is longer than the width of the text box, the text automatically continues on the next line of the control. Web developer can manage the height of the control, by setting the Rows property.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|Context||Software developer can use this property to access the HttpContext object for the current Web request. Using properties of the object software developer can access objects Application, Session, Request, Response, etc. which contain information about the current HTTP request. The object provides methods that allow him to get configuration information and to set or clear errors related to the request.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|Controls||This property allows software developer to access programmatically to the instance of the ControlCollection class for any server control. Using it he/she can add/remove controls to/from the collection or iterate through the server controls in the collection.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|DesignMode||This property returns true to indicate that the control is being used in the context of a designer. Software developer’s custom controls can use this property when design-time behavior is different than run-time behavior.||2.0, 3.0, 3.5, 4.0|
|Disabled||This property is used to get or set a value indicating whether the HTML server control is disabled. Its default value is false i.e. the control is enabled. In the browser, a disabled element or control is read-only, with the following added restrictions:
– its value is not submitted with the form,
– the element or control cannot receive focus
– the element or control is skipped when navigating the document by tabbing.
|1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|EnableTheming||This property overrides Control. EnableTheming.
The property indicates whether themes are enabled for a specified control. When the property’s value is true, the application’s theme directory is searched for control skins to apply. If for the particular control skin does not exist in the directory, skins are not applied. When the property’s value is false, the theme directory is not searched and the contents of the SkinID property are not used.
|2.0, 3.0, 3.5, 4.0|
|EnableViewState||Software developer must enable view state for the server control setting its value to true if he/she wants to maintain its state across HTTP requests. Sometimes is better to set value of this property to false if for example Web application is loading a database request into a server control. In this case application performance will be improved.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|Events||This read-only property returns a list of event handler delegates for the control. The type of this property is EventHadlerList, which uses a linear search algorithm to find entries in the list of delegates. When the list of delegates is large, finding entries with this property will be slow, because a linear search algorithm is inefficient when working with a large number of entries.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|HasChildViewState||Software developer can use this property to verify that any child controls of the server control are storing view-state information. Using it in this way he/she can avoid unnecessary calls to the ClearChildViewState method.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|ID||Web developers can set this property by declaring ID attribute in the opening tag of an ASP.NET server control. Another possible way to set it is programmatically. If this property is not specified for a server control, either declaratively or programmatically, Web developer can obtain a reference to the control through its parent control’s Controls property.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|IdSeparator||Software developer can’t use this property directly from his/her code, because it supports the .NET Framework infrastructure. The character contained in this property ( by default $ ) is used to separate the control identifiers for child controls. The ID separator character is appended to the ID property.||2.0, 3.0, 3.5, 4.0|
|InnerHtml||This property gets or sets (modifies) the content found between the opening and closing tags of the specified HTML server control. The property does not automatically encode special characters to and from HTML entities. HTML entities allow Page developers to display special characters, such as the < character, that a browser would ordinarily interpret as having special meaning. The < character would be interpreted as the start of a tag and is not displayed on the page. To display the < character, Page developer should use the entity <.
Note: Because the text is not HTML encoded, it possible to embed script within HTML tags in the text. If this property is set dynamically using user input, Web developers should be sure to validate the value to reduce security vulnerabilities.
|1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|InnerText||This property gets or sets (modifies) the text between the opening and closing tags of the specified HTML server control. Unlike the InnerHtml property, the InnerText property automatically encodes special characters to and from HTML entities. HTML entities allow Page developers to display special characters, such as the < character, that a browser would ordinarily interpret as having special meaning. The < character would be interpreted as the start of a tag and is not displayed on the page. To display the < character, they should use the entity <.
Note: If there are no child controls, the InnerHtml property contains the value String.Empty.
|1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|IsChildControlStateCleared||This property has value true if children of this control do not use control state; otherwise, false.||2.0, 3.0, 3.5, 4.0|
|IsTrackingViewState||This property returns value true if the control is marked to save changes to its view state; otherwise, false.
|1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|IsViewStateEnabled||This property returns value true if view state is enabled for the control; otherwise false. View state can be enabled at the page, container, or control level. When view state is disabled at the page or container level, view state is disabled for all controls contained by the page or container. The property indicates whether view state is enabled by pages, containers, or controls. In some cases it is possible values for the EnableViewState property and the IsViewStateEnabled property to be different. For example, if the Page containing the control has view state disabled, the EnableViewState property can be true while the IsViewStateEnabled property is false. Notes: Developers will set the EnableViewState property to indicate whether they are using view state with your control. Web developers can use this property in their code to determine whether view state is enabled for their control and all containers.||2.0, 3.0, 3.5, 4.0|
|LoadViewStateByID||This property returns value true if the control loads its view state by ID; otherwise, false. Its default value is false.||2.0, 3.0, 3.5, 4.0|
|Name||This string property is used to get or set the unique identifier name for the HtmlTextArea control. The property’s get accessor returns the value of the Control.UniqueID property. Note: The property’s set accessor does not assign a value to this property because the Name property must have the same value as the Control. UniqueID property for the HtmlTextArea control to work properly.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|NamingContainer||Using this property software developer can get a reference to the server control’s naming container, which creates a unique namespace for differentiating between server controls with the same Control.ID property value.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|Page||Provides a reference to the web page that contains this control as a System.Web.UI.Page object. This property’s value reflects the name of the .aspx file that contains the server control.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|Parent||This property provides a reference to the control that contains this control. If the control is placed on the page directly (rather than inside another control), it will return a reference to the page object.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|Rows||This property is used to get or set the height (in characters) of the HtmlTextArea control. Its default value is -1, which indicates that this property is not set. If the end user enters text that takes up more lines than the height specified, scroll bars are enabled.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|Site||Using this property software developer can get information about the container that hosts the current control when rendered on a design surface. A site binds a Component object to a Container object and enables communication between the two. It also provides a way for the container to manage its components.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|SkinID||This property overrides Control.SkinID.
Web developer can get or set the skin to apply to the control. Skins available to a control are contained in one or more skin files in a theme directory. The SkinID property specifies which of these skins to apply to the control. A skin is specific to a particular control i.e. software developer cannot share skin setting between controls of different types. If developer does not set the SkinID property, a control uses the default skin if one is defined.
|2.0, 3.0, 3.5, 4.0|
|Style||Web developer can use this property to get a collection of text attributes that will be rendered as a style attribute on the outer tag of the Web server control. This property will render on all browsers for all controls.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|TagName||Web developers can use this property to get the name of the control tag. This property is used primarily by control developers.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|TemplateControl||This property is used to get or set a reference to the template that contains this control.||2.0, 3.0, 3.5, 4.0|
|TemplateSourceDirectory||Software developer can use this property to get the path to the page or user control that contains the current control. If the web page is installed in https://www.somesite.com/apps/application1 the property will return “apps/application1”.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|UniqueID||This property can be used to get the unique, hierarchically qualified identifier for the server control. This property differs from the ID property, in that the UniqueID property includes the identifier for the server control’s naming container. This identifier is generated automatically when a page request is processed. This property is particularly important in differentiating server controls contained within a data-binding server control that repeats as Repeater, DataList, DetailsView, FormView, and GridView Web server controls.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|Value||This string property returns or sets the text entered in the HtmlTextArea control. This property is commonly used to retrieve the text entered in the text box, but Web developer can also use it to determine the text to display in the control. This is useful if he/she wants to provide a default value or display a message in the HtmlTextArea control.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|ViewState||Web developers can use this property to get a dictionary of state information that allows them to save and restore the view state of a server control across multiple requests for the same page.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|ViewStateIgnoresCase||This property returns true if StateBag object is insensitive; otherwise, false. Its default value is false.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|
|Visible||Web developers can use this property to get or set a value that indicates whether a server control is rendered as UI on the page. If the control is visible on the page this property will has value true; otherwise false.||1.0,1.1, 2.0, 3.0, 3.5, 4.0|