RequiredFieldValidator Class
Assembly: System.Web.Mobile (in system.web.mobile.dll)
This class behaves identically to the ASP.NET System.Web.UI.WebControls.RequiredFieldValidator control.
By default, Command controls on a form raise validator controls on the form to perform validation when the form is submitted to the server. To disable automatic validation, set the CausesValidation property on the Command to false.
The following code example requires a user to enter a number from 1 to 23. It uses both the RangeValidator and the RequiredFieldValidator to validate user entries.
<%@ Page Language="VB" Inherits="System.Web.UI.MobileControls.MobilePage" %> <%@ Register TagPrefix="mobile" Namespace="System.Web.UI.MobileControls" Assembly="System.Web.Mobile" %> <script runat="server"> Private Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Const uNameExpr As String = "^[a-zA-Z](.{1,9})$" Const phoneExpr As String = _ "((\(\d{3}\) ?)|(\d{3}-))?\d{3}-\d{4}" ' Define validation expressions. RegExprVal1.ValidationExpression = uNameExpr RegExprVal2.ValidationExpression = phoneExpr ReqFldVal1.Text = "User name is required" RegExprVal1.Text = "Must be between 2 to 10 characters" RegExprVal2.Text = "Please provide a valid number: (425) 555-0187" ' ErrorMessages appear in ValidationSummary. RegExprVal1.ErrorMessage = "Incorrect UserName format. Name" & _ " can be 2 to 10 characters long" ReqFldVal1.ErrorMessage = "User name required" RegExprVal2.ErrorMessage = _ "Please provide a valid number: (000) 000-0000" End Sub Private Sub OnCmdClick(ByVal sender As Object, ByVal e As EventArgs) If (Page.IsValid) Then ActiveForm = Form2 End If End Sub </script> <html xmlns="http:'www.w3.org/1999/xhtml" > <body> <mobile:Form runat="server" id="Form1" > <mobile:Label runat="server" id="Label1" Text="Your information" StyleReference="title" /> <mobile:Label runat="server" id="Label2" Text="User Name (required)" /> <mobile:Textbox runat="server" id="TextBox1"/> <mobile:RequiredFieldValidator runat="server" id="ReqFldVal1" ControlToValidate="TextBox1" /> <mobile:RegularExpressionValidator runat="server" id="RegExprVal1" ControlToValidate="TextBox1" /> <mobile:Label runat="server" id="Label3" Text="Phone" /> <mobile:Textbox runat="server" id="TextBox2"/> <mobile:RegularExpressionValidator runat="server" id="RegExprVal2" ControlToValidate="TextBox2" /> <mobile:ValidationSummary ID="ValidationSummary1" FormToValidate="Form1" HeaderText="Error Summary:" runat="server" /> <mobile:Command runat="server" id="Command1" Text="Submit" OnClick="OnCmdClick"/> </mobile:Form> <mobile:Form id="Form2" runat="server" > <mobile:Label ID="Label4" runat="server" Text="Thank You." /> </mobile:Form> </body> </html>
System.Web.UI.Control
System.Web.UI.MobileControls.MobileControl
System.Web.UI.MobileControls.TextControl
System.Web.UI.MobileControls.BaseValidator
System.Web.UI.MobileControls.RequiredFieldValidator
Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.
Reference
RequiredFieldValidator MembersSystem.Web.UI.MobileControls Namespace
System.Web.UI.WebControls.RequiredFieldValidator
RangeValidator Class
BaseValidator Class
CompareValidator Class
RegularExpressionValidator Class
ValidationSummary