static extern int ToAsciiEx(uint uVirtKey, uint uScanCode, byte [] lpKeyState,

Public Declare Function ToAsciiEx Lib "user32" (ByVal uVirtKey As UInteger, ByVal uScanCode As UInteger, ByVal lpKeyState As Byte(), <Out()> ByVal lpChar As System.Text.StringBuilder, ByVal uFlags As UInteger, ByVal hkl As IntPtr) As Integer