How to implement CANCEL button in ASP.Net wizard?

I am trying to use CANCEL button in ASP.Net wizard. I added CANCEL button from wizard properties.
I am able to display the button on the wizard. I am trying to apply functionality in the codebehind for this button.

Protected Sub wizardPurchase_CancelButtonClick(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.WizardNavigationEventArgs) Handles wizardPurchase.CancelButtonClick
            //CODE GOES HERE
      End Sub

I am getting this error when I click the button.

How do I write functionality for CANCEL button?

cancel-button.bmp
error.bmp