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Logical Operators, If Then Else and Select Case Statements, Looping and Counting

Logical Operators, If Then Else and Select Case Statements, Looping and Counting
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One of the goals of computer programming is telling the computer what to do when something occurs, and how to do it. This is performed by setting conditions, examining them and stating what decisions the computer should make. To perform the necessary conditions, you have two main options: Microsoft Access or Microsoft Visual Basic.

Microsoft Access is equipped with a series of operators and functions destined to perform various operations. To use a condition in Microsoft Access, if you know the structure of the conditional statement, you can write it after typing an assignment operator. Because most conditions in Microsoft Access are in the form of functions, we will study them later on. For now, we will learn how to write conditions in the Microsoft Visual Basic language.
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I need some help in understanding why I keep getting an error message called "invalid use of Null" when I run this code.

Brief summary: I have 5 check boxes for 5 different machine models (R610,R620, R630,R670, R690). The checkboxes serve a different purpose in the subroutines below but once selected I wantto assign a Module level variable call "Model" to them respectively.

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