Conditional Statements in .NET framework

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Conditional Statements
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4 The remainder of the code is the same as in the For loop
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Sub Count-Click(ByVa1 sender As Object, ByVal e As SystemEventArgs) Dim i As Integer i = CInt(StartValueText) Do While i c 10
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i = i + l
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Loop StartValueEnabled = False ResultVisible = True ResultValueVisible = True ResultvalueText = CStr (i) ResultValueEnab1ed = False End Sub
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The Do Loop While Loop
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The Do Loop While loop is a variation of the Do While loop, except the ASPNET engine doesn't evaluate the conditional expression until code within the Do Loop code block executes at least once There are four parts to a Do Loop While loop: The Do keyword The code block that contains statements that are executed at least once even if the condition is false The Loop While keywords The condition Here's how to structure the Do Loop While loop:
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Do 'Place statements that are executed at least once Loop While condition
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The ASPNET engine enters the code block of the Do Loop, executes the code, and then evaluates the condition following the While keyword If the condition is true, then statements within the Do Loop are executed again and then the ASPNET engine reevaluates the expression If the condition is false, then statements within the Do Loop are skipped the second time, causing the ASPNET engine to execute the statement below the Loop While keyword Try this example of the Do Loop While In this example, we're still asking the visitor to enter the start value for the count However, the ASPNET engine uses a Do Loop While to count
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Here's what is happening:
1 An Integer variable called i is declared 2 The contents of the StartValue text box, which is a string, is converted to an Integer and assigned to the variable 3 The ASPNET engine adds 1to the variable and assigns the sum to the variable 4 The ASPNET engine then evaluates the condition
5 If the condition is true, then the ASl NET reenters the code block and adds 1 to the variable and assigns the sum to the variable 6 If the condition is false, then the ASPNET no longer reenters the code block but instead executes statements that follow the Loop While keywords
Sub Count-Click(ByVa1 sender As Object, ByVal e As SystemEventArgs) Dim i As Integer i = CInt (StartValueText) Do i = i + l Loop While i c 10 StartValueEnabled = False ResultVisible = True ResultValueVisible = True Resultvalue Text = CStr (i) ResultValueEnabled = False End Sub
The Do Until Loop
The Do Until loop tells the ASPNET engine to execute one or more statements until the condition is true That is, as long as the condition is false, the ASPNET engine executes statements within the code block of the Do Until loop There are four parts to a Do Until loop: The Do Until keyword The conditional expression The code block The Loop keyword Here is the structure of the Do Until loop:
Do Until condition 'Place statements that are executed if the condition is false Loop
Conditional Statements
Let's take a look at a simple example that illustrates how to use a Do Until loop This is basically the same as the Do While example, except we are using a Do Until loop The ASPNET engine is told to add l to the value of the variable and assign the sum to the variable until the value of the variable is equal to 10
Sub Count-Click(ByVa1 sender As Object, ByVal e As SysternEventArgs) Dim i As Integer i = CInt (StartvalueText) Do Until i = 10 i = i + l Loop StartValueEnabled = False ResultVisible = True ResultValueVisible = True Resultvalue Text = CStr (i) ResultValueEnab1ed = False End Sub
The Do Loop Until Loop
The Do Loop Until loop is a variation of the Do Until loop, except the ASPNET engine doesn't evaluate the conditional expression until code within the Do Loop code block executes at least once There are four parts to a Do Loop Until loop: The Do keyword The code block that contains statements that are executed at least once even if the condition is false The Loop Until keywords The condition Here's how to structure the Do Loop Until loop:
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