How do I : Remove un-used code

Question

Hello:
 
I have some un-used code and would like to clean up my application. Example below is the kind of code that I would like to remove.
 
private void tabPage1_Click(object sender, EventArgs e)
{
}
 
If I comment the lines, I can not run the application. How can I remove this from everywhere in the project?
I have a bunch of items like this thruout my project.