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if doorone = llOpenllX O r doorTwo 'Only one door i s open end i f
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"OpenI1 t h e n
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Not Logical Operator The Not logical operator reverses the logic of a logical expression For example, we can tell the ASPNET engine to determine that the value of the user ID is not "Bob" by using the Not logical operator This is like saying, "I passed that test-not!" meaning that you didn't pass the test Here is how we write this expression:
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i f Not userID = "Bobf1t h e n
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'The v a l u e of t h e userID i s o t h e r t h a n I1Bobl1 end i f
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The ASPNET engine initially evaluates the userID = "Bob" expression to determine if this expression is true If it is true, then the Not logical operator tells the ASPNET engine to reverse this logic, making the expression false Likewise, if the user ID is not "Bob", the Not operator reverses this logic, making the logical expression true
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AndAlso The AndAlso logical operator combines two logical expressions If the first logical expression isn't true, then the ASPNET engine doesn't evaluate the second logical expression The second logical expression is evaluated only if the first logical expression is true
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TIP: This replaces the And operatox
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CHAPTER 4 Variables and Expressions i n ASPNET
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The following example illustrates how to use the AndAlso logical operator If the value of varl is equal to or greater than var2, then the first logical expression is false, and therefore the third expression is also false The ASPNET engine doesn't evaluate the second expression
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varl c var2 AndAlso var3 'Execute these statements end if if
var4 then
OrElse The OrElse logical operator works much like the AndAlso logical operator However, if the first logical expression is true, then the ASPNET engine doesn't evaluate the second logical expression
TIP: This replaces the Or operatol:
The following example shows you how to use the OrElse logical operator If the value of variable varl is less than the value of variable var2, then the first logical operator is true and the third logical expression is true Therefore, ASPNET skips the second logical expression:
varl c var2 OrElse var3 > var4 then 'Execute these statements end if if
Assignment Operator
The assignment operator (Table 4-2) assigns the value from the right side of the operator to the variable on the left side of the operator, as you saw done earlier in this chapter when you assigned a value to a variable as shown here:
Dim FirstName As String FirstName = llBobll
Typically, the assignment operator is used with an arithmetic operator to perform two operations in one In the next example, we'll take a look at the += assignment operator to see how two operations are combined into one operator You are familiar with the first two lines of this example Each declares a variable and initializing it with a value The last line is new to you The += assignment operator tells the ASPNET engine to add the value of variable b to variable a and then replace (assign) the value of variable a with the sum of variable a and b
Dim a As Integer Dim b As Integer a += b
10 2
ASPNET 20 Demystified
Operator
Description
Assign Add value and then assign Subtract value and then assign Multiply value and then assign Divide value and then assign Integer division and then assign Exponentiation assignment
Table 4-2 Assignment Operators
No doubt this is confusing, so let's take apart the last line to see the two actions the ASPNET engine is taking First it is told to add the values stored in variable a and variable b The sum is 12 This is the same as the following: Next the ASPNET engine is told to replace the value of variable a, which is 10, with the sum, which is 12 This is the same as the following: The value of variable a is 12 after the ASPNET engine finishes The other combinations of operators shown in Table 4-2 cause the ASPNET engine to perform actions similar to that of the += operator, except each performs a different combination of operations For example, the -= operator subtracts variable b from variable a and then assigns the difference to variable a
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