How to write This code in a simpler way c#

So I have created a list of if statments below however I am trying to find a simpler way of writing it instead of repeating the if blocks multiple times.

string text = "";
int number = int.Parse(textbox.Text);

if (number == 10){
 text= "ten";
}else if (number == 20){
text= "twenty";
}else if (number == 30 ){
text= "thirty";
}else if (number == 100){
text= "hundred";
}