Private Sub CustomValidator1_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs) Handles CustomValidator1.ServerValidate args.IsValid = args.Value.Length > 5 End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click If Me.IsValid Then Label1.Visible = True Label1.Text = "Input data format is valid." Else Label1.Visible = False End If End Sub
args.IsValid = args.Value.Length > 5
End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If Me.IsValid Then
Label1.Visible = True
Label1.Text = "Input data format is valid."
Else
Label1.Visible = False
End If
End Sub