How do I do it in VB.NET?

This tutorial explain some of the more common migrating problems from VB to VB.NET.

• DoEvents
  
  VB6
  DoEvents
  
  VB7
  System.Windows.Forms.Application.DoEvents
  

• App Object
  
  Get the full application filepath
  
  VB6
  App.Path & App.EXEName
  
  VB7 System.Reflection.Assembly.GetExecutingAssembly.Location.ToString
  
  Get the app's instance
  
  VB6 App.hInstance
  
  VB7
  System.Runtime.InteropServices.Marshal.GetHINSTANCE _(System.Reflection.Assembly.GetExecutingAssembly.GetModules() _(0)).ToInt32()
  
  Check for a previous instance
  
  VB6
  App.PrevInstance
  
  VB7
  Function PrevInstance() As Boolean
  If Ubound(Diagnostics.Process.GetProcessesByName(Diagnostics.Process.GetCurrentProcess).ProcessName)) > 0 Then
  Return True
  Else
  Return False
  End If
  
  End Sub
  

• Graphics
  
  Load a picture
  
  VB6
  Picture1.Picture = LoadPicture(path)
  
  VB7
  Dim img As Image = Image.FromFile(path)
  Picture1.Image = img
  
  Load a icon
  
  VB6
  Me.Icon = LoadPicture(path)
  
  VB7
  Dim ico As New Icon(path)
  Me.Icon = ico
  
  
• File I/0
  
  Read from a file
  
  VB6
  Open path For Input As #1
  Line Input #1, buffer
  Close #1
  
  VB7
  Dim fs As FileStream = File.Open(path, FileMode.OpenOrCreate, _ FileAccess.Read)
  Dim sr As New StreamReader(fs)
  Buffer = sr.ReadLine
  sr.Close
  
  Write to a file
  
  VB6
  Open path For Output As #1
  Write #1, buffer
  Close #1
  
  VB7
  Dim fs As FileStream = File.Open(path, FileMode.OpenOrCreate, _
  FileAccess.Write)
  Dim sr As New StreamWriter(fs)
  sr.Write(buffer)
  sr.Close
  
  
• Errors
  
  Check for an error
  
  VB6
  On Error Goto errhandler
  ...
  errhandler:
  MsgBox(err.Description)
  
  VB7
  Try
  ...
  Throw New Exception("error description goes here")
  ...
  Catch e as Exception
  MsgBox(e.Description)
  End Try
  
  
• Events
  
  Handling an event
  
  In VB7, there is a new keyword called AddHandler. AddHandler makes handling events a snap.
  
  AddHandler object.event, AddressOf procedure