Visual Basic 6 to .NET Function Equivalents

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1 Introduction
2 Notes
3 Miscellaneous
4 Strings
5 Files & Directories
6 Arrays
7 Date & Time
8 Math
9 See also
10 References
11 External links

[edit] Introduction

The information provided here is intended to help Visual Basic 6 developers who are making the switch to Visual Basic .NET and who wish to learn how to accomplish tasks without the use of the Microsoft.VisualBasic namespace (which contains all of the legacy Visual Basic 6 functions).

Do not be mistaken; by using functions in the Microsoft.VisualBasic namespace, you are not using "old code," because all of those functions map to their new equivalents within the .NET Framework. The main benefit of avoiding these functions is so you can familiarize yourself with the namespaces contained in the .NET Framework.

If you would like to remove the Microsoft.VisualBasic namespace, you can do one of two things:

Manually remove the import every time you start a new project.
Create a project template that does not include the Microsoft.VisualBasic namespace.

To create a template, take look at these links:

[edit] Notes

Some functions listed here may not be exact equivalents, but are the closest that are available.
You are encouraged to use the Object Browser (F2) to explore the .NET namespaces yourself.
Click on any of the .NET equivalent functions to visit Microsoft Developer Network (MSDN) and find out more information about that function.

[edit] Miscellaneous

Visual Basic 6	.NET Equivalent
App.Path	Application.StartupPath
CallByName	Type Object.InvokeMember
Circle	Graphics Object.DrawEllipse
Collection	Collections.Hashtable, Collections.Dictionary
Command	Environment.GetCommandLineArgs
DoEvents	Application.DoEvents
Environ	Environment.GetEnvironmentVariable
Err	Deprecated - Use Exception object and Try ... Catch ... End Try statement
Error	Exception Object.Message
GetSetting	Deprecated - Look into Configuration.ConfigurationSettings
IIf	Deprecated
InputBox	Deprecated - Make your own form
Len	Runtime.InteropServices.Marshal.SizeOf
MsgBox	MessageBox.Show
RGB	Color Object.FromArgb
SavePicture	Image Object.Save
SaveSetting	Deprecated - Look into Configuration.ConfigurationSettings
SendKeys	SendKeys.Send
Shell	Process.Start
Switch	Deprecated
TypeName	Any Object.GetType.ToString
Unload	Deprecated
VarType	Any Object.GetType

[edit] Strings

Visual Basic 6	.NET Equivalent
Asc	Convert.ToInt32(Char)
Chr	Convert.ToChar
Format	Any Object.ToString(Format String)
FormatCurrency	Any Numeric Object.ToString("c")
FormatDateTime	Date Object.ToString(Format String), Date Object.ToLongDateString
FormatNumber	Any Numeric Object.ToString(Format String)
FormatPercent	Any Numeric Object.ToString("p")
Hex	Integer Object.ToString("x"), Convert.ToString(Integer, 16)
InStr	String Object.IndexOf
InStrRev	String Object.LastIndexOf
Join	String.Join
LCase	String Object.ToLower
Left	String Object.Substring
Len	String Object.Length
LTrim	String Object.TrimStart
Mid	String Object.Substring
Oct	Convert.ToString(Integer, 8)
Replace	String Object.Replace
Right	String Object.Substring
RTrim	String Object.TrimEnd
Space	String Object.PadLeft, String Object.PadRight
Split	String Object.Split
String	String Object = New String(Char, Count)
StrReverse	Dim c() As Char = Array.Reverse(String Object.ToCharArray)
Trim	String Object.Trim
UCase	String Object.ToUpper

[edit] Files & Directories

Visual Basic 6	.NET Equivalent
ChDir	IO.Directory.SetCurrentDirectory
CurDir	IO.Directory.GetCurrentDirectory
Dir	IO.Directory.GetFiles, IO.Directory.GetDirectories, IO.Directory.Exists, IO.File.Exists
EOF	IO.StreamReader.Peek = -1
FileAttr	Deprecated - Use StreamReader or StreamWriter
FileCopy	IO.File.Copy
FileDateTime	IO.File.GetLastAccessTime, IO.File.GetCreationTime
FileLen	IO.FileStream Object.Length
GetAttr	IO.File.GetAttributes
Loc	IO.Stream Object.Position
LOF	IO.Stream Object.Length
MkDir	IO.Directory.CreateDirectory
RmDir	IO.Directory.Delete
SetAttr	IO.File.SetAttributes

[edit] Arrays

Visual Basic 6	.NET Equivalent
Filter	Array.BinarySearch
UBound	Any Type of Array.GetUpperBound(0)

[edit] Date & Time

Visual Basic 6	.NET Equivalent
DateAdd	Date Object.Add
DateDiff	Date Object.Subtract
Now	DateTime.Now

[edit] Math

Visual Basic 6	.NET Equivalent
Abs	Math.Abs
Atn	Math.Atan
Cos	Math.Cos
Exp	Math.Exp
Fix	Math.Floor (for negative numbers), Math.Ceiling (for positive numbers)
Int	Math.Floor
Log	Math.Log
Randomize	Deprecated - Random Object is automatically randomized declared
Rnd	System.Random Object.Next
Round	Math.Round
Sgn	Math.Sign
Sin	Math.Sin
Sqr	Math.Sqrt
Tan	Math.Tan