The Try It Out Lines 11 & 12 contain instructions that when I coded them, caused errors.
To Fix 'em:
Line 11. I needed to "switch back to the Checkout.aspx.
vb code.", not global.asax.
Line 12. Apparently there is not a constructor signature with these two arguments for a new SqlException object. I found that if I replaced "New SqlException..." with "New Exception... " it would work. (Leave the 2nd constructor argument as "SqlEx", because
SqlException inherits from Exception.)
VV