KeyPress(char key) not working with key # and &

in c# i used to 

```
using Desktop.Robot
using Desktop.Robot.Extensions

private readonly Robot _robot
_robot.KeyPress(#)
_robot.KeyPress(&)
```

=> with two key is # or & then _robot.KeyPress() not working. But it is working with remain key same as @ ! $ %....
Please help me check it, does robot lib support for key # and &