Open the Validate ISBN Solution.sln file contained in the VB2017Chap07Validate ISBN Solution folder. The interface provides a text box for entering a 13-character ISBN. The btnValidate_Click procedure should use the ISBN’s check digit, which is the last digit in the number, to determine whether the ISBN is valid. (The check digit algorithm is shown earlier in Figure 7-25.) If the ISBN is valid, the procedure should display the “Valid” message in the lblStatus control; otherwise, it should display the “Not valid” message. Code the procedure. Save the solution and then start and test the application. (If the user enters 9781285860268, the btnValidate_Click procedure should display the “Valid” message.)
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