Hi, How Can I Remove Duplicate Lines From a textBox in C#?

Question

Hi, How Can I Remove Duplicate Lines From a textBox in C#?

For Example my textbox contains:

apple
car
computer
male
female
text
computer
male
mobile

After click the "REMOVE DUPLICATE" button it will look like below:

apple
car
computer
male
female
text
mobile

----___----
Thanks.