visual basic conditional assignment

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VB.NET Conditional Statements

Fastest entity framework extensions.

The If...Then and If...Then...Else are conditional control statements. Using conditional statements, the program can behave differently based on a defined condition checked during the statement's execution.

The If...Then is the simplest form of control statement, frequently used in decision making and changing the control flow of the program execution.

The basic syntax of the If...Then statement is shown below.

An If...Then statement consists of an expression that determines whether a program statement or statements execute.

The following example shows the usage of a simple If...Then statement.

If...Then...Else

In an If...Then...Else statement, if the condition evaluates to true , the Body of the conditional statement runs. If the condition is false , the else-statement runs.

The basic syntax of the If...Then...Else statement is shown below.

It conditionally executes a group of statements, depending on the value of an expression.

The following example shows the usage of a simple If...Then...Else statement.

Multiple If...Then...Else Statements

In some cases, we need to use a sequence of If...Then structures or multiple If...Then...Else statements, where the Else clause is a new If structure.

• If we use nested If structures, the code would be pushed too far to the right.
• In such situations, it is allowed to use a new If right after the Else and it is considered a good practice.

In the above example, a series of comparisons of a variable marks to check If...Then , it is one of the grades (such as A+, A, B, C, or D). Every following comparison is done only in the case that the previous comparison was not true . In the end, if none of the If...Then conditions are not fulfilled, the last Else clause is executed.

The result of the above example is shown below.

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• VISUAL BASIC

Conditions (if, select case, logical operations) in Visual Basic

Conditions are vital parts of any application as this is usually what drives the logic of an application.

There are multiple options available in Visual Basic to execute certain code based on the condition

If Statement

This is the most common way to decide if the code within the If statement body should be executed. If statement simply evaluates the expression to Boolean True or False and executes the code if expression is True . This means that all expressions must result in either True or False value

However the following code will result in the runtime exception as String value cannot be cast to Boolean

while the following snippet is valid as comparison of 2 String values results into the Boolean value

Fallback Value

It is possible to specify the fallback value for the statement, i.e. block of code which should be executed if the main condition is False

Select Case

If it is required to perform the check against multiple constant values, instead of using If-ElseIf it is possible to use Select Case . Although, Select Case can be considered redundant to If-ElseIf , it is widely used as it allows to create a simple, more readable code. Select Case statement also supports fallback value using the Case Else statement.

The below code converts the position of the day in the week to its text representation. It throws an error if the specified value is outside of 1-7 range as this would be an invalid input.

Logical Operators

Visual basic supports 3 logical operators: And , Or and Not

• Result of And operators will be equal to True if all of its arguments are equal to True
• Result of Or operators will be equal to True if at least one of its arguments is equal to True
• Not operator reverses the value

Operators can be grouped with parenthesis to define the order of operations

The following table demonstrates the results based on the values and operator

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Visual Basic Conditional Statements

• If Then Else
• If Then Else If Else
• Nested If Then
• Switch Statement

If Then - Back to top

Output: Close Account!

If Then Else - Back to top

Output: We love having you with us!

If Then Else If Else - Back to top

Output: Please find a Europe tour cruise package in your mailbox!

Nested If Then - Back to top

Output: Maintain a minimum balance Pal! You got 5 days time.

Switch Statement - Back to top

Output: Other Number!

The If...Then...ElseIf statement acts like the If...Then...Else expression, except that it offers as many choices as necessary. The formula is:

The program will first examine Condition1 . If Condition1 is true, the program will execute Statment1 and stop examining conditions. If Condition1 is false, the program will examine Condition2 and act accordingly. Whenever a condition is false, the program will continue examining the conditions until it finds one that is true. Once a true condition has been found and its statement executed, the program will terminate the conditional examination at End If . Here is an example:

This would produce:

There is still a possibility that none of the stated conditions be true. In this case, you should provide a "catch all" condition. This is done with a last Else section. The Else section must be the last in the list of conditions and would act if none of the primary conditions is true. The formula to use would be:

Here is an example:

• Start Microsoft Visual Basic and create a Console Application named BCR3
• In the Solution Explorer, right-click Module1.vb and click Rename
• Type BethesdaCarRental.vb and press Enter
• Accept to change the file name
• To use an If...Then...ElseIf condition, change the document as follows:   Module BethesdaCarRental Public Function Main() As Integer Dim EmployeeNumber As Long, EmployeeName As String Dim CustomerName As String Dim RentStartDate As Date, RentEndDate As Date Dim NumberOfDays As Integer Dim RateType As String, RateApplied As Double Dim OrderTotal As Double Dim OrderInvoice As String RateType = "Weekly Rate" RateApplied = 0 OrderTotal = RateApplied EmployeeNumber = _ CLng(InputBox("Employee number (who processed this order):", "Bethesda Car Rental", "00000")) If EmployeeNumber = 22804 Then EmployeeName = "Helene Mukoko" ElseIf EmployeeNumber = 92746 Then EmployeeName = "Raymond Kouma" ElseIf EmployeeNumber = 54080 Then EmployeeName = "Henry Larson" ElseIf EmployeeNumber = 86285 Then EmployeeName = "Gertrude Monay" Else EmployeeName = "Unknown" End If CustomerName = InputBox("Enter Customer Name:", _ "Bethesda Car Rental", "John Doe") RentStartDate = CDate(InputBox("Enter Rent Start Date:", _ "Bethesda Car Rental", #1/1/1900#)) RentEndDate = CDate(InputBox("Enter Rend End Date:", _ "Bethesda Car Rental", #1/1/1900#)) NumberOfDays = DateDiff(DateInterval.Day, RentStartDate, RentEndDate) RateApplied = CDbl(InputBox("Enter Rate Applied:", _ "Bethesda Car Rental", 0)) OrderInvoice = "===========================" & vbCrLf & "=//= BETHESDA CAR RENTAL =//=" & vbCrLf & "==-=-= Order Processing =-=-==" & vbCrLf & "------------------------------------------------" & vbCrLf & "Processed by:" & vbTab & EmployeeName & vbCrLf & "Processed for:" & vbTab & CustomerName & vbCrLf & "------------------------------------------------" & vbCrLf & "Start Date:" & vbTab & RentStartDate & vbCrLf & "End Date:" & vbTab & RentEndDate & vbCrLf & "Nbr of Days:" & vbTab & NumberOfDays & vbCrLf & "------------------------------------------------" & vbCrLf & "Rate Type:" & vbTab & RateType & vbCrLf & "Rate Applied:" & vbTab & RateApplied & vbCrLf & "Order Total:" & vbTab & FormatCurrency(OrderTotal) & vbCrLf & "===========================" MsgBox(OrderInvoice, MsgBoxStyle.Information Or MsgBoxStyle.OkOnly, "Bethesda Car Rental") Return 0 End Function End Module
• Execute the application
• Close the message box and the DOS window to return to your programming environment

As introduced in Lesson 5 and as seen in lessons thereafter, we know that a function is used to perform a specific assignment and produce a result. Here is an example:

When performing its assignment, a function can encounter different situations, some of which would need to be checked for truthfulness or negation. This means that conditional statements can assist a procedure with its assignment.

A function is meant to return a value. Sometimes, it will perform some tasks whose results would lead to different results. A function can return only one value (we saw that, by passing arguments by reference, you can make a procedure return more than one value) but you can make it render a result depending on a particular behavior. If a function is requesting an answer from the user, since the user can provide different answers, you can treat each result differently. Consider the following function:

At first glance, this function looks fine. The user is asked to provide a number. If the user enters a number less than 18 (excluded), the function returns Teen. Here is an example of running the program:

If the user provides a number between 18 (included) and 55, the function returns the Adult. Here is another example of running the program:

What if there is an answer that does not fit those we are expecting? The values that we have returned in the function conform only to the conditional statements and not to the function. Remember that in If Condidion Statement , the Statement executes only if the Condition is true. Here is what will happen. If the user enters a number higher than 55 (excluded), the function will not execute any of the returned statements. This means that the execution will reach the End Function line without encountering a return value. This also indicates to the compiler that you wrote a function that is supposed to return a value, but by the end of the method, it didn't return a value. Here is another example of running the program:

The compiler would produce a warning:

To solve this problem, you have various alternatives. If the function uses an If...Then condition, you can create an Else section that embraces any value other than those validated previously. Here is an example:

This time, the Else condition would execute if no value applies to the If or ElseIf conditions and the compiler would not produce a warning. Here is another example of running the program:

An alternative is to provide a last return value just before the End Function line. In this case, if the execution reaches the end of the function, it would still return something but you would know what it returns. This would be done as follows:

If the function uses an If condition, both implementations would produce the same result.

• To use a conditional statement in a function, change the document as follows:   Module BethesdaCarRental Private Function GetEmployeeName(ByVal EmplNbr As Long) As String Dim Name As String If EmplNbr = 22804 Then Name = "Helene Mukoko" ElseIf EmplNbr = 92746 Then Name = "Raymond Kouma" ElseIf EmplNbr = 54080 Then Name = "Henry Larson" ElseIf EmplNbr = 86285 Then Name = "Gertrude Monay" Else Name = "Unknown" End If Return Name End Function Public Function Main() As Integer Dim EmployeeNumber As Long, EmployeeName As String Dim CustomerName As String Dim RentStartDate As Date, RentEndDate As Date Dim NumberOfDays As Integer Dim RateType As String, RateApplied As Double Dim OrderTotal As Double Dim OrderInvoice As String RateType = "Weekly Rate" RateApplied = 0 OrderTotal = RateApplied EmployeeNumber = CLng(InputBox( "Employee number (who processed this order):", "Bethesda Car Rental", "00000")) EmployeeName = GetEmployeeName(EmployeeNumber) CustomerName = InputBox("Enter Customer Name:", _ "Bethesda Car Rental", "John Doe") RentStartDate = CDate(InputBox("Enter Rent Start Date:", _ "Bethesda Car Rental", #1/1/1900#)) RentEndDate = CDate(InputBox("Enter Rend End Date:", _ "Bethesda Car Rental", #1/1/1900#)) NumberOfDays = DateDiff(DateInterval.Day, RentStartDate, RentEndDate) RateApplied = CDbl(InputBox("Enter Rate Applied:", _ "Bethesda Car Rental", 0)) OrderInvoice = "===========================" & vbCrLf & "=//= BETHESDA CAR RENTAL =//=" & vbCrLf & "==-=-= Order Processing =-=-==" & vbCrLf & "------------------------------------------------" & vbCrLf & _ "Processed by:" & vbTab & EmployeeName & vbCrLf & "Processed for:" & vbTab & CustomerName & vbCrLf & "------------------------------------------------" & vbCrLf & "Start Date:" & vbTab & RentStartDate & vbCrLf & "End Date:" & vbTab & RentEndDate & vbCrLf & "Nbr of Days:" & vbTab & NumberOfDays & vbCrLf & "------------------------------------------------" & vbCrLf & "Rate Type:" & vbTab & RateType & vbCrLf & "Rate Applied:" & vbTab & RateApplied & vbCrLf & "Order Total:" & vbTab & FormatCurrency(OrderTotal) & vbCrLf & "===========================" MsgBox(OrderInvoice, MsgBoxStyle.Information Or MsgBoxStyle.OkOnly, "Bethesda Car Rental") Return 0 End Function End Module

The IIf() function can also be used in place of an If...Then...ElseIf scenario. When the function is called, the Expression is checked. As we saw already, if the expression is true, the function returns the value of the TruePart argument and ignores the last argument. To use this function as an alternative to If...Then...ElseIf statement, if the expression is false, instead of immediately returning the value of the FalsePart argument, you can translate that part into a new IIf function. The pseudo-syntax would become:

In this case, if the expression is false, the function returns the TruePart and stops. If the expression is false, the compiler accesses the internal IIf function and applies the same scenario. Here is example:

We saw that in an If...Then...ElseIf statement you can add as many ElseIf conditions as you want. In the same, you can call as many IIf functions in the subsequent FalsePart sections as you judge necessary:

As we have seen so far, the Choose function takes a list of arguments. To use it as an alternative to the If...Then...ElseIf...ElseIf condition, you can pass as many values as you judge necessary for the second argument. The index of the first member of the second argument would be 1. The index of the second member of the second argument would be 2, and so on. When the function is called, it would first get the value of the first argument, then it would check the indexes of the available members of the second argument. The member whose index matches the first argument would be executed. Here is an example:

So far, we have used only strings for the values of the second argument of the Choose() function. In reality, the values of the second argument can be almost anything. One value can be a constant. Another value can be a string. Yet another value can come from calling a function. Here is an example:

The values of the second argument can even be of different types.

• To use the Choose() function, change the document as follows: Module BethesdaCarRental Private Function GetEmployeeName(ByVal EmplNbr As Long) As String Dim Name As String If EmplNbr = 22804 Then Name = "Helene Mukoko" ElseIf EmplNbr = 92746 Then Name = "Raymond Kouma" ElseIf EmplNbr = 54080 Then Name = "Henry Larson" ElseIf EmplNbr = 86285 Then Name = "Gertrude Monay" Else Name = "Unknown" End If Return Name End Function Public Function Main() As Integer Dim EmployeeNumber As Long, EmployeeName As String Dim CustomerName As String Dim Tank As Integer, TankLevel As String Dim RentStartDate As Date, RentEndDate As Date Dim NumberOfDays As Integer Dim RateType As String, RateApplied As Double Dim OrderTotal As Double Dim OrderInvoice As String RateType = "Weekly Rate" RateApplied = 0 OrderTotal = RateApplied EmployeeNumber = CLng(InputBox("Employee number (who processed this order):", "Bethesda Car Rental", "00000")) EmployeeName = GetEmployeeName(EmployeeNumber) CustomerName = InputBox("Enter Customer Name:", "Bethesda Car Rental", "John Doe") Tank = CInt(InputBox("Enter Tank Level:" & vbCrLf & "1. Empty" & vbCrLf & "2. 1/4 Empty" & vbCrLf & "3. 1/2 Full" & vbCrLf & "4. 3/4 Full" & vbCrLf & "5. Full", "Bethesda Car Rental", 1)) TankLevel = Choose(Tank, "Empty", "1/4 Empty", "1/2 Full", "3/4 Full", "Full") RentStartDate = CDate(InputBox("Enter Rent Start Date:", "Bethesda Car Rental", #1/1/1900#)) RentEndDate = CDate(InputBox("Enter Rend End Date:", "Bethesda Car Rental", #1/1/1900#)) NumberOfDays = DateDiff(DateInterval.Day, RentStartDate, RentEndDate) RateApplied = CDbl(InputBox("Enter Rate Applied:", _ "Bethesda Car Rental", 0)) OrderInvoice = "===========================" & vbCrLf & "=//= BETHESDA CAR RENTAL =//=" & vbCrLf & "==-=-= Order Processing =-=-==" & vbCrLf & "------------------------------------------------" & vbCrLf & "Processed by:" & vbTab & EmployeeName & vbCrLf & "Processed for:" & vbTab & CustomerName & vbCrLf & "------------------------------------------------" & vbCrLf & "Car Selected:" & vbCrLf & vbTab & "Tank:" & vbTab & TankLevel & vbCrLf & "------------------------------------------------" & vbCrLf & "Start Date:" & vbTab & RentStartDate & vbCrLf & "End Date:" & vbTab & RentEndDate & vbCrLf & "Nbr of Days:" & vbTab & NumberOfDays & vbCrLf & "------------------------------------------------" & vbCrLf & "Rate Type:" & vbTab & RateType & vbCrLf & "Rate Applied:" & vbTab & RateApplied & vbCrLf & "Order Total:" & vbTab & FormatCurrency(OrderTotal) & vbCrLf & "===========================" MsgBox(OrderInvoice, MsgBoxStyle.Information Or MsgBoxStyle.OkOnly, "Bethesda Car Rental") Return 0 End Function End Module
• Eexecute the application

The Switch() function is a prime alternative to the If...Then...ElseIf...ElseIf condition. The argument to this function is passed as a list of values. As seen previously, each value is passed as a combination of two values:

As the function is accessed, the compiler checks each condition. If a condition X is true, its statement is executed. If a condition Y is false, the compiler skips it. You can provide as many of these combinations as you want. Here is an example:

In a true If...Then...ElseIf...ElseIf condition, we saw that there is a possibility that none of the conditions would fit, in which case you can add a last Else statement. The Switch() function also supports this situation if you are using a number, a character, or a string. To provide this last alternative, instead of a ConditionXToCheck expressionk, enter True , and include the necessary statement. Here is an example:

Remember that you can also use True with a character. Here is an example:

• To use the Switch() function, change the document as follows: Module BethesdaCarRental Private Function GetEmployeeName(ByVal EmplNbr As Long) As String Dim Name As String If EmplNbr = 22804 Then Name = "Helene Mukoko" ElseIf EmplNbr = 92746 Then Name = "Raymond Kouma" ElseIf EmplNbr = 54080 Then Name = "Henry Larson" ElseIf EmplNbr = 86285 Then Name = "Gertrude Monay" Else Name = "Unknown" End If Return Name End Function Public Function Main() As Integer Dim EmployeeNumber As Long, EmployeeName As String Dim CustomerName As String Dim TagNumber As String, CarSelected As String Dim Tank As Integer, TankLevel As String Dim RentStartDate As Date, RentEndDate As Date Dim NumberOfDays As Integer Dim RateType As String, RateApplied As Double Dim OrderTotal As Double Dim OrderInvoice As String RateType = "Weekly Rate" RateApplied = 0 OrderTotal = RateApplied EmployeeNumber = CLng(InputBox("Employee number (who processed this order):", "Bethesda Car Rental", "00000")) EmployeeName = GetEmployeeName(EmployeeNumber) CustomerName = InputBox("Enter Customer Name:", "Bethesda Car Rental", "John Doe") TagNumber = InputBox("Enter the tag number of the car to rent:", "Bethesda Car Rental", "000000") CarSelected = Microsoft.VisualBasic.Switch( TagNumber = "297419", "BMW 335i", TagNumber = "485M270", "Chevrolet Avalanche", TagNumber = "247597", "Honda Accord LX", TagNumber = "924095", "Mazda Miata", TagNumber = "772475", "Chevrolet Aveo", TagNumber = "M931429", "Ford E150XL", TagNumber = "240759", "Buick Lacrosse", True, "Unidentified Car") Tank = CInt(InputBox("Enter Tank Level:" & vbCrLf & "1. Empty" & vbCrLf & "2. 1/4 Empty" & vbCrLf & "3. 1/2 Full" & vbCrLf & "4. 3/4 Full" & vbCrLf & "5. Full", "Bethesda Car Rental", 1)) TankLevel = Choose(Tank, "Empty", "1/4 Empty", "1/2 Full", "3/4 Full", "Full") RentStartDate = CDate(InputBox("Enter Rent Start Date:", "Bethesda Car Rental", #1/1/1900#)) RentEndDate = CDate(InputBox("Enter Rend End Date:", _ "Bethesda Car Rental", #1/1/1900#)) NumberOfDays = DateDiff(DateInterval.Day, RentStartDate, RentEndDate) RateApplied = CDbl(InputBox("Enter Rate Applied:", _ "Bethesda Car Rental", 0)) OrderInvoice = "===========================" & vbCrLf & "=//= BETHESDA CAR RENTAL =//=" & vbCrLf & "==-=-= Order Processing =-=-==" & vbCrLf & "------------------------------------------------" & vbCrLf & "Processed by:" & vbTab & EmployeeName & vbCrLf & "Processed for:" & vbTab & CustomerName & vbCrLf & "------------------------------------------------" & vbCrLf & "Car Selected:" & vbCrLf & vbTab & "Tag #:" & vbTab & TagNumber & vbCrLf & vbTab & "Car:" & vbTab & CarSelected & vbCrLf & vbTab & "Tank:" & vbTab & TankLevel & vbCrLf & "------------------------------------------------" & vbCrLf & "Start Date:" & vbTab & RentStartDate & vbCrLf & "End Date:" & vbTab & RentEndDate & vbCrLf & "Nbr of Days:" & vbTab & NumberOfDays & vbCrLf & "------------------------------------------------" & vbCrLf & "Rate Type:" & vbTab & RateType & vbCrLf & "Rate Applied:" & vbTab & RateApplied & vbCrLf & "Order Total:" & vbTab & FormatCurrency(OrderTotal) & vbCrLf & "===========================" MsgBox(OrderInvoice, MsgBoxStyle.Information Or MsgBoxStyle.OkOnly, "Bethesda Car Rental") Return 0 End Function End Module

•  » 
• VISUAL BASIC 10

Conditional Statements in Visual Basic .NET

In this article, I will explain you about Conditional Statements in Visual Basic .NET If....Else Statement The control statements which allows us if a condition is true execute a expression and if it is False execute a different expression is If conditional expression. The expression followed by Then keyword will be executed if the condition is true, otherwise the expression followed by ElseIf keyword will be checked and if it is true then that expression will be executed. Example: Imports System. Console Module Module1       Sub Main()         Dim A As Integer         Write( "Enter a Number, 10 or 20 or 30" )         A = Val(ReadLine())        'ReadLine() method is used to read from console

         If A = 10 Then             WriteLine( "Ten" )         ElseIf A = 20 Then             WriteLine( "Twenty" )         ElseIf A = 30 Then             WriteLine( "Thirty" )         Else             WriteLine( "Number not 10,20,30" )         End If         Read()       End Sub   End Module

The Select Case control structure is nearly same as the If....ElseIf control structure. Select Case Statement can make decision only on one statement. Select Case is preferred when your code has the ability to handle many conditions of a particular variable. Select Case is use to test the expression, which of the given cases it matches and execute the code in that expression.

Imports System. Console Module Module1       Sub Main()         Dim Password As Integer         Write( "Enter a number between 1 and 6" )         Password = Val(ReadLine())           Select Case Password             Case 1                 WriteLine( "You entered 1" )             Case 2                 WriteLine( "You entered 2" )             Case 3                 WriteLine( "You entered 3" )             Case 4                 WriteLine( "You entered 4" )             Case 5                 WriteLine( "You entered 5" )             Case 6                 WriteLine( "You entered 6" )           End Select         Read()     End Sub

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Saturday, November 30, 2013

Vb .net basics: conditionals, logical operators and short-circuiting.

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Use conditional expression for assignment (IDE0045)

• 2 contributors

This style rule concerns the use of a ternary conditional expression versus an if-else statement for assignments that require conditional logic.

Options specify the behavior that you want the rule to enforce. For information about configuring options, see Option format .

dotnet_style_prefer_conditional_expression_over_assignment

Suppress a warning.

If you want to suppress only a single violation, add preprocessor directives to your source file to disable and then re-enable the rule.

To disable the rule for a file, folder, or project, set its severity to none in the configuration file .

To disable all of the code-style rules, set the severity for the category Style to none in the configuration file .

For more information, see How to suppress code analysis warnings .

• Use conditional expression for return (IDE0046)
• Code style language rules
• Code style rules reference

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