Overriding Equals(object obj)

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C#

I Overrided Equal(Object obj) in a Class for example Student class for removing an item from a list box when I entered the name and family of a student in textBoxes after that my Add method didn't work. why it happened?

Student s = new student();
s.name=TextBox1.text;
s.family=TextBox2.text;
Lst1.Items.Add(s);

above code didn't work when I overrided Equals(Object obj) For removing items from listBox.

Lst1.Items.Remove(s);