How does requiredfieldvalidator work

Gets or sets the width of the Web server control. AddedControl Control, Int AddParsedSubObject Object. ApplyStyle Style. ApplyStyleSheetSkin Page. Applies the style properties defined in the page style sheet to the control. Begins design-time tracing of rendering data. BuildProfileTree String, Boolean. Verifies whether the specified control is on the page and contains validation properties.

Deletes the control-state information for the server control's child controls. Deletes the view-state information for all the server control's child controls. CopyBaseAttributes WebControl. Binds a data source to the invoked server control and all its child controls.

DataBind Boolean. Binds a data source to the server control's child controls. Determines whether the validation control can perform client-side validation. Enables a server control to perform final clean up before it is released from memory.

Ends design-time tracing of rendering data. Creates an identifier for controls that do not have an identifier assigned. Equals Object. Determines whether the specified object is equal to the current object. Inherited from Object. Called during the validation stage when ASP. NET processes a Web Form. FindControl String. FindControl String, Int Sets input focus to a control. Gets the client ID of the specified control.

GetControlValidationValue String. Gets the value associated with the specified input control. Gets design-time data for a control. Serves as the default hash function. GetRouteUrl Object. Gets the URL that corresponds to a set of route parameters. GetRouteUrl String, Object. Gets the URL that corresponds to a set of route parameters and a route name. Determines if the server control contains any child controls. Returns a value indicating whether events are registered for the control or any child controls.

Determines if the server control holds only literal content. LoadControlState Object. LoadViewState Object. Loads the previously saved state for the control.

MapPathSecure String. Retrieves the physical path that a virtual path, either absolute or relative, maps to. MergeStyle Style. OnDataBinding EventArgs. OnInit EventArgs. OnLoad EventArgs. OnPreRender EventArgs. OnUnload EventArgs. OpenFile String. Assigns any sources of the event and its information to the control's parent. Registers code on the page for client-side validation.

RemovedControl Control. Render HtmlTextWriter. Displays the control on the client. RenderChildren HtmlTextWriter. RenderContents HtmlTextWriter. RenderControl HtmlTextWriter. Gets the control adapter responsible for rendering the specified control. ResolveClientUrl String. Gets a URL that can be used by the browser. ResolveUrl String. Converts a URL into one that is usable on the requesting client. Sets design-time data for a control.

SetTraceData Object, Object. Returns a string that represents the current object. Occurs when the server control binds to a data source. Occurs when the server control is initialized, which is the first step in its lifecycle. Occurs when the server control is unloaded from memory. GetAttribute String. Gets an attribute of the Web control with the specified name. SetAttribute String, String. Sets an attribute of the Web control to the specified name and value.

SetOwnerControl Control. FindDataSourceControl Control. Returns the data source that is associated with the data control for the specified control.

FindFieldTemplate Control, String. Returns the field template for the specified column in the specified control's naming container. FindMetaTable Control. It is generally tied to a text box to force input into the text box.

The CompareValidator control compares a value in one control with a fixed value or a value in another control. The RegularExpressionValidator allows validating the input text by matching against a pattern of a regular expression. The regular expression is set in the ValidationExpression property. Apart from single character match, a class of characters could be specified that can be matched, called the metacharacters.

The CustomValidator control allows writing application specific custom validation routines for both the client side and the server side validation. The client side validation is accomplished through the ClientValidationFunction property.

The client side validation routine should be written in a scripting language, such as JavaScript or VBScript, which the browser can understand. The server side validation routine must be called from the control's ServerValidate event handler.

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