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Page.Validate Method ()

Instructs any validation controls included on the page to validate their assigned information.

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

public virtual void Validate ()
public void Validate ()
public function Validate ()
Not applicable.

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.

When this method is invoked, it iterates through the validation controls contained in the ValidatorCollection object associated with the Page.Validators property and invokes the validation logic for each validation control in the current validation group. The validation group is determined by the control that posted the page to the server. If no validation group is specified, then no validation group is used.

NoteNote:

The behavior of page validation has changed. In ASP.NET 2.0, controls no longer call the Page.Validate method; they use the Page.Validate(String) method instead. If you use the Page.Validate method on an ASP.NET 2.0 page, validation groups are ignored and all controls are validated.

Notes to Inheritors: The Validate method is not used by ASP.NET 2.0. When you are using ASP.NET 2.0, override the Validate(String) method to change page validation behavior.

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

Security noteSecurity 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 (Visual Studio).

<%@ Page Language="C#" %>

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

<script runat="server">

  protected void Button_Click(object sender, EventArgs e)
  {
    switch (((Button)sender).ID)
    {
      case "Button1":
        if (TextBoxValidator1.IsValid)
        {
          Label1.Text = "TextBox validates.";
        }
        else
        {
          Label1.Text = "";
          Label4.Text = "";
        }
        break;
      case "Button2":
        // Must explicitly cause Validate here because 
        // Button2 has CausesValidation set to false.
        Validate("Group2");
        if (CustomValidator.IsValid)
        {
          Label2.Text = "CheckBox validates.";
        }
        else
        {
          Label2.Text = "";
          Label4.Text = "";
        }
        break;
      default:
      Label1.Text = "";
      Label2.Text = "";
      break;
        
    }
  }

  // Custom validator for check box.
  protected void CustomValidator_ServerValidate(object source, ServerValidateEventArgs args)
  {
    args.IsValid = (CheckBox1.Checked == true);
  }

  protected void Page_Load(object sender, EventArgs e)
  {
    if (IsPostBack && Context.Request.Form["__EVENTTARGET"] == "TextBox2")
    {
      // Handle AutoPostBack TextBox.
      Validate("Group3");
      if (Page.IsValid)
      {
        Label3.Text = "AutoPostBack TextBox validates.";
      }
      else
      {
        Label3.Text = "";
        Label4.Text = "";
      }
    }
    
  }

  protected void Button3_Click(object sender, EventArgs e)
  {
    Validate();
    if (Page.IsValid)
      Label4.Text = "All controls valid.";
    else
    {
      Label1.Text = "";
      Label2.Text = "";
      Label3.Text = "";
      Label4.Text = "";
    }

  }
</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>

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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