Hai i am Using ultraNumericEditor. I want to show message to the user , if ultraNumericEditor value is empty. How to do this?

For UltraTextEditor ,

i am using

  If String.IsNullOrEmpty(Trim(txtProjectNo.Text)) Then
                  txtProjectNo.Focus()
                  Messagebox.Show("Project cant be left empty")

      End If

What is the case for ultraNumericEditor?