Hayati Güney dilim döndüğünce ;)

[DllImport("coredll.dll", SetLastError = true)]
 static extern void keybd_event(byte bVk, byte bScan, int dwFlags, int dwExtraInfo);

 void KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == '\r')
            {
                e.Handled = true;
                //SendKeys.Send("{TAB}");
                const byte vkTab = 0x09;

                const int keyeventfKeyup = 0x2;
                const int keyeventfKeydown = 0x0;
                keybd_event(vkTab, 0, keyeventfKeydown, 0);
                keybd_event(vkTab, 0, keyeventfKeyup, 0);
            }

        }