Visual Basic .NET/Visual Basic 6 to .NET Function Equivalents

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: What you will need to change about the project template How to make a project template 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 and find out more information about that function. 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 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") FormatDateTimeDate 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 Files & Directories Visual Basic 6.NET Equivalent ChDir IO.Directory.SetCurrentDirectory CurDir IO.Directory.GetCurrentDirectory DirIO.Directory.GetFiles, IO.Directory.GetDirectories, IO.Directory.Exists, IO.File.Exists EOF IO.StreamReader.Peek = -1 FileAttrDeprecated - 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 Arrays Visual Basic 6.NET Equivalent Filter Array.BinarySearch UBound Any Type of Array.GetUpperBound(0) Date & Time Visual Basic 6.NET Equivalent DateAdd Date Object.Add DateDiff Date Object.Subtract Now DateTime.Now Math Visual Basic 6.NET Equivalent Abs Math.Abs Atn Math.Atan Cos Math.Cos Exp Math.Exp Fix Math.Truncate, 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 External links MSDN Library fr:Visual Basic .NET/Fonctions VB6 en .NET