Page.IsValid Property
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.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.
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"; }