I need to modify the Items to add things like size, reference URL's, additional pictures, etc.  To do this, I added additional columns in Item.xsd and added copied the code (and changed the variable names) wherever the other parameters were passed.

However, when I run the website, I crash and get a Column (variable) is Not a Member of Table Item error.  I am assuming that the changes made to the Schema Item tables are not being recognized.  I'm using XML and not SQL since I am not a programmer and at least I can sort of understand that.

I read an old post that mentioned something about remake the XML and save it over, but I didnt understand which XML file and I dont want to save over the existing .xsd file without knowing what I'm doing.

So what could be causing my error?