Option Explicit
Private Const REG_SZ = 1    'Constant for a string variable type.
Private Const HKEY_LOCAL_MACHINE = &H80000002
Private Declare Function RegCreateKey Lib "advapi32.dll" Alias "RegCreateKeyA" (ByVal hKey As Long, _
   ByVal lpSubKey As String, phkResult As Long) As Long
Private Declare Function RegSetValueEx Lib "advapi32.dll" Alias "RegSetValueExA" (ByVal hKey As Long, _
   ByVal lpValueName As String, ByVal Reserved As Long, ByVal dwType As Long, lpData As Any, _
   ByVal cbData As Long) As Long
Private Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
Private Sub Command1_Click()
   Dim DataSourceName As String
   Dim DatabaseName As String
   Dim Description As String
   Dim DriverPath As String
   Dim DriverName As String
   Dim LastUser As String
   Dim Regional As String
   Dim Server As String
   Dim lResult As Long
   Dim hKeyHandle As Long   'Specify the DSN parameters.
   DataSourceName = "<the name of your new DSN>"
   DatabaseName = "<name of the database to be accessed by the new DSN>"
   Description = "<a description of the new DSN>"
   DriverPath = "<path to your SQL Server driver>"
   LastUser = "<default user ID of the new DSN>"
   Server = "<name of the server to be accessed by the new DSN>"
   DriverName = "SQL Server"   'Create the new DSN key.

   'Set the values of the new DSN key.
   lResult = RegCreateKey(HKEY_LOCAL_MACHINE, "SOFTWAREODBCODBC.INI" & DataSourceName, hKeyHandle)
   lResult = RegSetValueEx(hKeyHandle, "Database", 0&, REG_SZ, ByVal DatabaseName, Len(DatabaseName))
   lResult = RegSetValueEx(hKeyHandle, "Description", 0&, REG_SZ, ByVal Description, Len(Description))
   lResult = RegSetValueEx(hKeyHandle, "Driver", 0&, REG_SZ, ByVal DriverPath, Len(DriverPath))
   lResult = RegSetValueEx(hKeyHandle, "LastUser", 0&, REG_SZ, ByVal LastUser, Len(LastUser))
   lResult = RegSetValueEx(hKeyHandle, "Server", 0&, REG_SZ, ByVal Server, Len(Server))
   'Close the new DSN key.
   lResult = RegCloseKey(hKeyHandle)

   'Open ODBC Data Sources key to list the new DSN in the ODBC Manager.
   'Specify the new value.   'Close the key.
   lResult = RegCreateKey(HKEY_LOCAL_MACHINE, "SOFTWAREODBCODBC.INIODBC Data Sources", hKeyHandle)
   lResult = RegSetValueEx(hKeyHandle, DataSourceName, 0&, REG_SZ, ByVal DriverName, Len(DriverName))
   lResult = RegCloseKey(hKeyHandle)
End Sub