Name

IsValid

Synopsis

Boolean = Page.IsValid

Returns a Boolean value, indicating whether any validation controls on the page were unable to successfully validate user input.

Parameters

Boolean

A Boolean indicating whether the validation succeeded.

Example

The example uses the IsValid property to determine whether validation on the current page succeeded, and displays a message: 

<%@ Page Language="vb" %>
<html>
   <head>
      <title></title>
      <script runat="server">
         Sub Page_Load(  )
            If IsPostBack Then
               Page.Validate(  )
               If Page.IsValid Then
                  Message.Text = "Page is valid."
               Else
                  Message.Text = "Page is not valid."
               End If
            End If
         End Sub
      </script>
   </head>
<body>
   <form runat="server">
      Enter your name:
      <asp:textbox id="name" runat="server"/>
      <asp:requiredfieldvalidator 
         id="rfvName"
         controltovalidate="name"
         enableclientscript="false"
         errormessage="Required!"
         runat="server"/>
      <br/>
      <asp:button id="submit" Text="Submit" runat="server"/>
      <br/>
      <asp:label id="Message" runat="server"/>
   </form>
</body>
</html>

Notes

The IsValid property determines whether the overall validation performed by a form’s validator controls has succeeded. If the page has no validator controls, the property’s value is always True. Before checking the value of IsValid, you must either call the Page.Validate method, as shown in the example, or have submitted the page with a control (such as a Button, ImageButton, or LinkButton control) whose CausesValidation property is set to True. Otherwise, an exception will occur.

In the example, the ...

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