On chapter 17 on page 576 it has a web site database program using SQL using ASP. The code is for the DataGridView try it out starting on page 575. I run the code from the book and get declare the scalar variable "@original_au_id" when I edit that works but when I hit the update button the error comes up. Everything else works and the same thing happens to the source code from the web site after making some modifications to the sql connection. Does anyone know what to do to correct this problem?

You will need to set OldValuesParameterFormatString proterty to "original_{0}" for the asp:SqlDataSource control.
The new code would be

   <asp:SqlDataSource ID="sdsAuthors" Runat="server"
                      OldValuesParameterFormatString = "original_{0}"
                      ProviderName = "System.Data.SqlClient"
                      SelectCommand = "SELECT au_id, au_lname, au_fname, phone,
                      address, city, state, zip FROM authors"
                      UpdateCommand = "UPDATE authors SET au_lname = @au_lname,
                      au_fname = @au_fname, phone = @phone, address = @address,
                      city = @city, state = @state, zip = @zip
                      WHERE au_id = @original_au_id" >