[DllImport("Kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]

    private static extern bool IsWow64Process(IntPtr hProcess, out bool Wow64Process);

    [DllImport("Kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]

    private static extern bool Wow64DisableWow64FsRedirection(out IntPtr OldValue);

private void btnKlavyeAc_Click(object sender, EventArgs e)

    {

        try

        {

            bool bWow64 = false;

            IsWow64Process(Process.GetCurrentProcess().Handle, out bWow64);

            if (bWow64)

            {

                IntPtr OldValue = IntPtr.Zero;

                bool bRet = Wow64DisableWow64FsRedirection(out OldValue);

            }

            Process.Start(new ProcessStartInfo { UseShellExecute = true, FileName = "osk" });

        }

        catch (Exception ex)

        {

                           MessageBox.Show(ex.Message);

        }

    }