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vb.net是vb的升级。
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vb.net基于.net框架，是vb发展的必然趋势。
vb功能非常强大，但是也存在众多的缺点，所以微软才会开发vb.net。
随着时间的发展，vb.net完全取代vb是必然的
VB术语简介
说明下面的代码举例说明了用 Drive 对象来访问驱动器属性：Sub ShowFreeSpace(drvPath) Dim fs, d, s Set fs = CreateObject("Scripting.FileSystemObject") Set d = fs.GetDrive(fs.GetDriveName(drvPath)) s = "Drive " UCase(drvPath) " - " s = s d.VolumeName vbCrLf s = s "Free Space: " FormatNumber(d.FreeSpace/1024, 0) s = s " Kbytes" MsgBox sEnd Sub.
重新启动。vbnetfor循环占用cpu问题只要重新启动就可以了。VBNET是一种简单，现代，面向对象的计算机编程语言，它由微软开发，将NETFramework和公共语言运行库的强大功能相结合。
下载地址：
网页地址：;displaylang=zh-cn
自己到网上找注册码
用API函数，以下代码Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As LongPrivate Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function SetLayeredWindowAttributes Lib "user32" (ByVal hwnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As LongPrivate Const WS_EX_LAYERED = H80000
Private Const GWL_EXSTYLE = (-20)
Private Const LWA_ALPHA = H2
Private Const LWA_COLORKEY = H1Private Declare Function SetWindowPos Lib "user32" (ByVal hwnd As Long, ByVal hWndInsertAfter As Long, ByVal X As Long, ByVal Y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long
Private Const HWND_TOPMosT = -1
Private Const SWP_NOMOVE = H2
Private Const SWP_NosIZE = H1
Private Declare Function GetForegroundWindow Lib "user32" () As Long
Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Const WM_KEYDOWN = H100
Const WM_KEYUP = H101
Const WM_CHAR = H102
Const VK_F1 = H70
Private Sub SendF1(hwnd) '调用这个过程即可对目标窗体发送F1键
Call PostMessage(hwnd, WM_KEYDOWN, VK_F1, 0)
Call PostMessage(hwnd, WM_KEYUP, VK_F1, 0)
End Sub这里是发送F1的实例，各个按键对应的虚拟键码，要到网上查
保存文件的步骤为：
关闭流，特别是写入流
关闭并保存文件
示例代码如下：
Imports System.Windows.Forms
Imports System.IO
Imports System.Text
Sub SaveFileDemo()
'打开文件。如果文件不存在则创建新的文件
Dim myFile As New IO.FileStream("d:\data.txt", _
FileMode.OpenOrCreate, _
FileAccess.Write)
'在文件末尾添加一行
Dim tw As New StreamWriter(myFile)
myFile.Seek(0, SeekOrigin.End)
tw.WriteLine("白刃格斗英雄连英模部队方队亮相阅兵")
'关闭流
tw.Close()
'关闭文件并保存文件
myFile.Close()
End Sub
a="habcd"
if len(a)=2 then
msgbox "0" right(a,1)
else
msgbox right(a,2)
end if