IfThenElseifElse in .NET framework

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The last version of the If Then statement is the If ThenElseif Else statement This statement is a combination of the second and third versions of this code, except there is another Else part to the statement The IfThenElseif Else statement tells the ASPNET engine, "If the condition is true, then execute statements in the first code block, or else evaluate another condition If the other condition is true, then execute statements in the second code block, or else execute statements in the third code block if the second condition is false" Here's the structure of the If ThenElseifElse statement:
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'Place statements here that are executed 'if the first condition is true Else if (expression) 'Place statements here that are executed if the second condition is true Else 'Place statements here that are executed if the second condition is false End If
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Notice that the If ThenElseifElse statement contains three code blocks Statements in the first code block execute if the first conditional is true Statements in the second code block execute if the second conditional is true Statements in the third code block execute if the second conditional expressions are false Let's revise our previous example to use the If ThenElseifElse statement This is nearly identical to the previous example except that the ASPNET engine is told to display "Invalid User ID" in the LStatus text box if the user ID is neither Bob nor Mary Here's what we do:
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1 Set the Enabled property of the UserID text box to false to prevent the visitor from changing its contents 2 Set the Visible property of the Loginstatus label to true 3 Set the Visible property of the LStatus text box to true 4 Determine if the value of the UserID text box is Bob 5 If it is, then set the Text property of the LStatus text box to "Valid User ID" 6 Determine if the value of the UserID text box is Mary 7 If it is, then set the Text property of the LStatus text box to "Valid User ID" 8 If it isn't, then set the Text property of the LStatus text box to "Invalid User ID" 9 Set the Enabled property of the LStatus text box to false so that the visitor cannot change the validation status
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Sub Submit-Click(ByVa1 sender As Object, ByVal e As SystemEventArgs) UserIDEnabled = False LoginStatusVisible = True LStatusVisible = True If UserIDText = "Bob" Then LStatusText = "Valid User ID" Elseif UserIDText = "MaryU LStatusText = "Valid User IDu else LStatusText = "Invalid User IDu End If LStatusEnabled = False End Sub
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The Nested IfThen Statement
We purposely used simple examples in this chapter so that you don't become confused as you learn how to write the If Then statement Real-world ASPNET applications make decisions more complex than those shown in this book Let's look at a more challenging example of the If Then statement, one that is similar to those you'll find in real-world applications Let's say that you built an ASPNET web page that displays and processes an order form that requires a customer to enter country and postal codes among other information regarding the order You probably want to have data validated on the client side and then have the ASPNET engine validate the data too Here are the decisions that the ASPNET engine must make: 1 Did the customer enter a country code 2 Did the customer enter a postal code
3 If the customer entered both a country code and a postal code, then is the country code a valid country code 4 If the country code is a valid country code, then is the postal code a valid postal code for that country
By now you realize that a series of If Then statements are used to make these decisions However, positioning them can be tricky because a second decision is made only if a first condition is true; otherwise, the second decision is skipped The solution is to use a nested If Then statement Nested simply means that one If Then statement is within the code block of another If Then statement This is illustrated in the next example Assume that if the CountryCode variable and the PostalCode variable have a value of less than 1, then the customer didn't enter them on the order form Also assume that another process validated the country code and postal code and assign a value to the Valid variable indicating if these codes are valid The code follows this paragraph Notice that this is more complicated to read that other examples of the If Then statements that you've seen in this chapter This is because we are asking the ASPNET engine to make up to a four-step decision First the ASPNET engine evaluates the value of the CountryCode variable to determine if the visitor entered the country code Next it determines if the visitor entered the postal code The third step is to determine if the country code is valid And the last decision is to determine if the postal code is valid
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