Conditional Statements in .NET framework

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Conditional Statements
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A loop is used to execute one or more statements repeatedly without your having to write those statements more than once in your code A loop is something you wish you had back when you were in school and the teacher told you to write "I will keep quiet in class" 25 times on a piece of paper A loop lets you write it once and have the ASPNET engine write it 25 times There are three types of loops These are the For loop, the Do While loop, and the Do Until loop
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The For Loop
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The For loop tells the ASPNET engine to execute statements within a specific number of times This is like saying, "Write 'I will keep quiet in class' 25 times" The ASPNET exits the For loop and continues with the next statement below the loop once the maximum value is reached There are five parts to a For loop: The For keyword The For variable, which stores the current count The count range-a starting value and an ending value The code block that contains statements that are executed each time the For loop is executed The Next keyword Here's how to structure a For loop:
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For i = 1 to 10 'Place statements here Next i
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The For variable is like any variable that you use in your program (see 4), except it serves as the loop counter The count range specifies the starting and ending values for the count In this example, the count range is from 1 to 10When the For loop begins, the start value, which is 1, is assigned to the For variable The next time the For loop loops, the For variable is incremented by one This process continues until the outer count range is exceeded, causing the ASPNET engine to stop looping and continue with the statement that follows the next keyword at the end of the For loop In this example, this means that the ASPNET engine loops ten times
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Statements that you want to execute each time the For loop is looped must be placed between the For keyword and the Next keyword Try this example of a For loop Here's what is happening: The visitor is prompted to enter a starting value for the counters This is the value that is assigned to the For variable The ASPNET engine is then told to count by one until it reaches ten, when it stops and displays the last count on the screen Figure 5-5 shows the design of the web page You'll notice that we include all the objects on the web page and then make some invisible until we need them, using the same technique as you saw used in previous examples in this chapter The code follows after this list Here is what is happening in the code:
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1 The ASPNET engine displays the web page Notice that the Visible property of the Result label and that of Resultvalue text box are set to false so that they are not displayed (Figure 5-6) 2 The visitor then enters the starting number and clicks the Count button We're assuming that the number is less then ten; otherwise, statements in the loop are not executed
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Figure 5-5 Be sure to include all these objects in your design
Conditional Statements
Figure 5-6 The visitor is prompted to enter a starting value for the count
3 The ASPNET engine then declares an Integer variable called i 4 The For loop is then entered The start number that the visitor entered is a string data type (see 4) The For loop requires an Integer value Therefore, the ASPNET engine is told to convert the start number to an integer using the CM() conversion function that you learned about in 4 5 The ASPNET engine adds 1 to the variable until the value of the variable equals 10, at which time it breaks out of the For loop Notice there is no need to insert statements within the For loop, because we're only interested in the final value of the variable
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