Page.Validate Method (String)

 

Instructs the validation controls in the specified validation group to validate their assigned information.

Namespace:   System.Web.UI
Assembly:  System.Web (in System.Web.dll)

Public Overridable Sub Validate (
	validationGroup As String
)

Parameters

validationGroup
Type: System.String

The validation group name of the controls to validate.

This method is invoked when a user clicks any ASP.NET server control that has the CausesValidation property set to true, which is the default. These include the Button, ImageButton, and LinkButton Web server controls, the HtmlInputButton, HtmlInputImage, and HtmlButton HTML server controls, and controls that can automatically post back to the server such as the TextBox, CheckBox, ListControl, and BulletedList controls.

To disable validation for any button control on the page, set the button control's CausesValidation property to false.

The Validate method validates the specified validation group. After calling the Validate method on a validation group, the IsValid method will return true only if both the specified validation group and the validation group of the control that caused the page to be posted to the server are valid.

The following code example calls the Validate method on a page in a scenario with several different validation groups defined.

System_CAPS_security Security Note

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.

<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

  Protected Sub Button_Click(ByVal sender As Object, ByVal e As System.EventArgs)

    Select Case CType(sender, Button).ID
      Case "Button1"
        If TextBoxValidator1.IsValid Then
          Label1.Text = "TextBox validates."
        Else
          Label1.Text = ""
          Label4.Text = ""
        End If
      Case "Button2"
        ' Must explicitly cause Validate here because 
        ' Button2 has CausesValidation set to false.
        Validate("Group2")
        If CustomValidator.IsValid Then
          Label2.Text = "CheckBox validates."
        Else
          Label2.Text = ""
          Label4.Text = ""
        End If
      Case Else
        Label1.Text = ""
        Label2.Text = ""
    End Select

  End Sub

  Protected Sub CustomValidator_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs)

    args.IsValid = (CheckBox1.Checked)

  End Sub

  Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)

    If (IsPostBack) Then

    ' Handle AutoPostBack TextBox.
      Validate("Group3")
      If (Page.IsValid) Then
        Label3.Text = "AutoPostBack TextBox validates."
      Else
        Label3.Text = ""
        Label4.Text = ""
      End If
    End If

  End Sub

  Protected Sub Button3_Click(ByVal sender As Object, ByVal e As System.EventArgs)

    Validate()
    If (Page.IsValid) Then
      Label4.Text = "All controls valid."
    Else
      Label1.Text = ""
      Label2.Text = ""
      Label3.Text = ""
      Label4.Text = ""
    End If

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Page Validate</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      TextBox
      <asp:TextBox ID="TextBox1" ValidationGroup="Group1" runat="server"></asp:TextBox>
      <asp:RequiredFieldValidator Display="Static" ID="TextBoxValidator1" ValidationGroup="Group1" runat="server" ControlToValidate="TextBox1" ErrorMessage="(please enter some text)" EnableClientScript="False"></asp:RequiredFieldValidator>
      <br />
      CheckBox
      <asp:CheckBox ID="CheckBox1" ValidationGroup="Group2" runat="server" />
      <asp:CustomValidator ID="CustomValidator" ValidationGroup="Group2" runat="server" Text="(this option required)" OnServerValidate="CustomValidator_ServerValidate" EnableClientScript="False"></asp:CustomValidator>
      <br />
      <asp:Button ID="Button1" ValidationGroup="Group1" CausesValidation="true" runat="server" Text="Validate Group1 Controls" OnClick="Button_Click" />
      <asp:Label ID="Label1" runat="server"></asp:Label>
      <br />
      <asp:Button ID="Button2" ValidationGroup="Group2" CausesValidation="false" runat="server" Text="Validate Group2 Controls" OnClick="Button_Click" />
      <asp:Label ID="Label2" runat="server"></asp:Label>
      <br />
      <br />
      AutoPostBack TextBox
      <asp:TextBox AutoPostBack="true" ID="TextBox2" ValidationGroup="Group3" runat="server" CausesValidation="true"></asp:TextBox>
      <asp:RequiredFieldValidator ID="TextBoxValidator2" ValidationGroup="Group3" runat="server" ControlToValidate="TextBox2" ErrorMessage="(please enter some text)" EnableClientScript="False"></asp:RequiredFieldValidator>
      <asp:Label ID="Label3" runat="server"></asp:Label>
      <br />
      <br />
      <asp:Button ID="Button3" CausesValidation="true" runat="server" Text="Validate All Controls" OnClick="Button3_Click" />
      <asp:Label ID="Label4" runat="server"></asp:Label>

    </div>
    </form>
</body>
</html>

.NET Framework
Available since 2.0
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