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Page.IsValid Property

Gets a value indicating whether page validation succeeded.

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

'Declaration
Public ReadOnly Property IsValid As Boolean
'Usage
Dim instance As Page
Dim value As Boolean

value = instance.IsValid

/** @property */
public boolean get_IsValid ()

public function get IsValid () : boolean

Not applicable.

Property Value

true if page validation succeeded; otherwise, false.

Exception typeCondition

HttpException

The IsValid property is called before validation has occurred.

For this property to return true, all validation server controls in the current validation group must validate successfully. You should check this property only after you have called the Page.Validate method, or set the CausesValidation property to true in the OnServerClick event handler for an ASP.NET server control that initiates form processing. These server controls include the Button, HtmlButton, HtmlInputButton, HtmlInputImage, ImageButton, and LinkButton classes.

If you force validation of a validation group using the Validate method, then all validation controls in the specified validation group must validate successfully as well.

TopicLocation
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How to: Validate Required Entries for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Display Server Side Custom Validation Messages for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Test Validity Programmatically for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Against Patterns for ASP.NET Server ControlsBuilding ASP .NET Web Applications
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How to: Validate with a Custom Function for ASP.NET Server ControlsBuilding ASP .NET Web Applications
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How to: Validate Against Values in a Database for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Against a Range of Values for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Against a Specific Value for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Against a Data Type for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Specify Layout for In-Place Messages On ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Required Entries for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Display Server Side Custom Validation Messages for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Test Validity Programmatically for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Against Patterns for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Programmatically for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Format Validation Error Messages for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate with a Custom Function for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Disable Validation for ASP.NET Server ControlsBuilding ASP .NET Web Applications
Walkthrough: Validating User Input in a Web Forms PageBuilding ASP .NET Web Applications in Visual Studio

The following code example demonstrates using the IsValid property to set up a conditional statement. If the property returns true, the Text property of the lblOutput control is set to "Page is valid!" Otherwise, it is set to "Some of the required fields are empty."

Sub ValidateBtn_Click(sender As Object, e As EventArgs)
    Page.Validate()
    If (Page.IsValid) Then
        lblOutput.Text = "Page is Valid!"
    Else
        lblOutput.Text = "Some required fields are empty."
    End If
End Sub

void ValidateBtn_Click(Object sender, EventArgs e)
{
    this.get_Page().Validate();
    if (this.get_Page().get_IsValid() == true)
        lblOutput.set_Text("Page is Valid!");
    else
        lblOutput.set_Text("Some of the required fields are empty.");
}

function ValidateBtn_Click(Sender, e : EventArgs) 
{
    Page.Validate();
    if (Page.IsValid == true) 
        lblOutput.Text = "Page is Valid!";
    else
        lblOutput.Text = "Some required fields are empty";
}

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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