public static extern Int32 DriverPackageInstall([MarshalAs(UnmanagedType.LPTStr)] string DriverPackageInfPath, Int32 Flags, IntPtr pInstallerInfo, out bool pNeedReboot);

    public static extern Int32 DriverPackageInstall(

Public Declare Auto Function DriverPackageInstall Lib "DIFxAPI.dll" (ByVal DriverPackageInfPath As String, ByVal Flags As Int32, ByVal pInstallerInfo As IntPtr, ByRef pNeedReboot As Boolean) As Int32

Int32 InstallResult = DriverPackageInstall(infFile, Flags, ptrInstallerInfo, out fNeedReboot);

Dim InstallResult As Int32 = DriverPackageInstall(infFile, Flags, ptrInstallerInfo, fNeedReboot)