if userID = "BobI1 then 'Some statements end if in .NET framework

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if userID = "BobI1 then 'Some statements end if
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The expression is userID = "Bob" We placed the expression in an if then statement so that you don't confuse this logical expression with the expression that assigns the value "Bob" to the variable userID Besides, this example illustrates how a logical expression is typically used in an application As you'll learn in the next chapter, the if then statement tells the ASPNET engine to evaluate the logical expression and to execute a group of statements if the logical expression is true That is, if the value of the variable userID is "Bob", then the logical expression is true; otherwise, the logical expression is false and the group of statements are skipped Let's look at each of the different logical operators ASPNET offers
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And Logical Operator It is common that you'll combine two logical expressions together to form a third logical expression This probably sounds confusing, but let's take a look at an example to illustrate this technique Suppose the visitor to your site entered "Bob" as the user ID and "Bob555" as the password We need to ask the ASPNET engine to determine if both are valid Looking at the preceding example, you probably realize that we'll use a logical expression to evaluate each of them The first logical expression is
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and the second logical expression is
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"Bob555"
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However, both logical expressions must be true in order for the user ID and password to be valid Therefore, we need to join these to form a third logical expression by using the And logical operator The And logical operator tells the ASPNET engine that both expressions must be true for the third logical expression to be true
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Let's place these logical expressions in an if end statement so that you can see how this works
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if userID = "BobM And password 'Valid login end if
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"Bob555" then
If the value of the userID variable is "Bob", then the userID = "Bob" logical expression is true If the value of the password variable is "Bob555", then the password = "Bob555" logical expression is true If both logical expressions are true, then the login is valid and statements within the if then statement are executed by the ASPNET engine However, the third logical expression is false if either the first logical expression or the second logical expression is false Both must be true for the third logical expression to be true
Or Logical Operator The Or logical operator provides another way for you to join together two logical expressions The Or logical operator also forms a third logical expression However, the third logical expression is true if either the first logical expression or the second logical expression is true This too might sound confusing, so let's create another example to illustrate how this works Suppose there are two valid user IDs These are "Bob" and "Mary" For now we won't require a password We'll use the following logical expressions to determine if the value of the userID variable is either "Bob" or "Mary":
if userID = "Bobu Or userID 'Valid login end if
"Maryl' then
Here are the three logical expressions that are shown in this example:
UserID
"Bob1'
Or if userID = "Bob1' userID 'Valid login end if
"Maryl' then
If the value of the userID variable is Bob, then the first logical expression is true, and so the third logical expression is true also It doesn't matter if the second logical expression is true or not, because we used the Or logical operator to join together the first and second logical expressions If the value of the userID variable is Mary, then the second logical expression is true, and so the third logical expression is true also It doesn't matter if the first logical expression is true or not
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XOr Logical Operator There can be rare occasions when you want a group of statements to execute only if the first logical expression or the second logical expression is true-but not if both logical expressions are true To do this, we need to join together the first and second logical expressions using the XOr logical operator The XOr logical operator tells the ASPNET engine to evaluate both logical expressionsAs long as only one of them is true, then the third logical expression is true; otherwise, the third logical expression is false Let's see this in action The first logical expression in the following example determines if the value of the doorone variable is "Open" The second logical expression determines if the value of the doorTwo variable is "Open" The third logical expression is true if only one of the doors is open The third logical expression is false if both doors are closed or if both doors are open
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