Visual Basic Cheat Sheet

notes.vb

http://howtostartprogramming.com/vb-net/

' Data Types
Integer ' Simple numbers
Double ' Numbers with decimal points
String ' Text (a string of characters)
Boolean ' True or False


' Create a variable
Dim ... as Double ' Put the name of your variable here


' Create an array
Dim quotes(10) As String


' Ask user for value
Console.Write("What is the value of x? ")
Dim x as Integer = Console.ReadLine()


' If...Else If...Else
If ... Then ' Put a condition in here
    ...
Else If ... Then ' Put a different condition in here (optional)
    ...
Else ' Code below will be executed only if the above conditions aren't met (optional)
    ...
End if


' While loop (when we don't know how many times we need to loop)
Do
    ... ' Put the code you want to repeat here
Loop While ... ' Put the exit condition here


' For loop (when we know exactly how many times we want to loop)
For i as Integer = 0 To 10 Step 1 ' i is a variable inside the loop that tells us which iteration we're on
    ... ' Put the code you want to repeat here
Next i ' This tells the loop to step i and repeat the loop


' Define a structure
Structure ... ' Name of structure goes here
    Dim ... As ... ' Name of first field and field type go here
    ... ' Any other fields that you need follow the same pattern
End Structure


' Write to a file
My.Computer.FileSystem.WriteAllText(filename, text, append) ' first two args are String, last one is Boolean


' Exception handling, pulled from: https://msdn.microsoft.com/en-us/library/8a9f2ew0(v=vs.90).aspx
Try
    ' Starts a structured exception handler.
    ' Place executable statements that may generate 
    ' an exception in this block.
Catch '[optional filters]
    ' This code runs if the statements listed in 
    ' the Try block fail and the filter on the Catch statement is true.
'[Additional Catch blocks]
Finally
    ' This code always runs immediately before
    ' the Try statement exits.
End Try
' Ends a structured exception handler.