Data Types

Keyword	Type	System.	Suffix	VB.Net	Comments
bool	Boolean	System.Boolean		Boolean	(1 bit) true or false
string	Character	System.String		String	Reference Type
char	String	System.Char		Char	(16 bits) Unicode character (0 to 65,536 different characters) \u 000 to \u FFFF
n/a	Date	System.DateTime		Date	(64 bits) - Jan 1 100 to Dec 31 9999
float	Floating Point	System.Single	f or F	Single	(32 bits, 4 bytes) Single Precision Floating Point -3.402 E 38 to 3.4.02 E 38, precision ~6-9 digits
double	Floating Point	System.Double	d or D (R in VB.Net)	Double	(64 bits, 8 bytes) Double Precision Floating Point -1.797 E 308 to 1.797 E 308, precision ~15-17 digits
decimal	Floating Point	System.Decimal	m or M (D in VB.Net)	Decimal	(128 bits, 16 bytes) Precise Integer and Fractional type Can represent decimal numbers with 29 significant digits 1 E -28 to 7.9 E 28 Currency in VBA
sbyte	Integer	System.SByte			(8 bits) -128 to 127
byte	Integer	System.Byte		Byte	(8 bits) Unsigned Integer 0 to 255
short	Integer	System.Int16		Short	(16 bits) -32,768 to 32,767 Integer in VBA
ushort	Integer	System.UInt16			(16 bits) Unsigned Integer 0 to 65,535
int	Integer	System.Int32		Integer	(32 bits) -2,147,483,648 to 2,147,483,647
uint	Integer	System.UInt32	u or U		(32 bits) Unsigned Integer 0 to 4,294,967,295
long	Integer	System.Int64	l or L	Long	(64 bits) -9.2 E 18 to 9.2 E 18
ulong	Integer	System.UInt64	ul or UL		(64 bits) Unsigned Integer 0 to 1.84 E 19
object		System.Object		Object	Reference Type
n/a		System.Tuple			Reference Type

Intrinsic vs User Defined

Intrinsic are built-in
It is always best to use the data type that uses the smallest amount of space (i.e. bytes) yet can still handle all the data assigned to it. The smaller the bytes the faster it executes.
You should use the data type conversion functions instead of using the Val() function when you want to convert from one data type to another.

Boxing - Forcing value types to act as reference types
Casting - Converting objects of one type into another type

Casting can either be narrowing or widening

Dynamic Types

VB	C#
If (myObject IsNot Nothing) Then	If (!myObject.Equals(null))
End If	{
	}

TypeName(x)	x.GetType.ToString();

GetType(Integer)	typeof(int);

nothing	null

DateTime is not a built-in C# type

Initialising

VB	C#
Dim b As Byte = &H2A 'hex	byte o = 0x2A;
Dim o As Byte = &O52 'octal
Dim ed As Date = #12/31/2007 12:15:00 PM#
Dim amount As Decimal = 23.99@	decimal amount = 23.99m;
Dim number As Single = 2.9!	float number = 2.9f;
Dim total As Long = 23432L

System.Convert.ToInt16(sNumber) 
System.Convert.ToDouble(sNumber)

Type.GetTypeCode()     = TypeCode.String

Decimal instead of Currency

The Currency data type in VBA has been replaced with the Decimal data type in VB.NET.
In most cases these will be interchangeable however they do actually differ in their precision.
The Decimal data type in .NET is more accurate than the VBA Currency data type
The Decimal data type is a fixed-precision of the decimal point.
Decimal values require the suffix "m" or "M".
You can force a data type to a literal value to Decinal by adding "D" to the end of the literal value. For example 2344534D is forced to be interpreted as a Decimal, without the "D" the literal value is interpreted as a Long.

User Defined Data Types

You define custom data types outside of procedures at the top of your module. Once you have created your type use the Dim statement to declare a variable of that type.

This method allows you to define an object that encapsulates and validates its own data.
Remember: An object variable declared "As New" contains "Nothing" until the first time you refer to it in code

After you have finished with any objects you must set any refernces to it to "Nothing" in order to free the memory space & resources
Perhaps the most common is a structure to pass to an API call. You may also have to pass in parameters that are strings are finite length

Important

It is possible to create your own user defined types by usingthe "Type" statement. This is covered later
When defining a user defined type all variables within the type should be in capitals