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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)

[BrowsableAttribute(false)]
public bool IsValid { get; }

Property Value

Type: System.Boolean
true if page validation succeeded; otherwise, false.

ExceptionCondition
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
How to: Validate Against a Range of Values 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: Test Validity Programmatically for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Programmatically for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Disable Validation for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Against Values in a Database for ASP.NET Server ControlsBuilding ASP .NET Web Applications
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How to: Validate Against a Specific Value for ASP.NET Server ControlsBuilding ASP .NET Web Applications
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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: 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
How to: Validate Programmatically 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: Format Validation Error Messages 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: Display Server Side Custom Validation Messages for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Required Entries 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: Validate Against a Specific Value for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Against Values in a Database for ASP.NET Server ControlsBuilding ASP .NET Web Applications

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."


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


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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