ASCX controls, how to prevent multiple inclusions of same Javascript file?

By example we have two webparts on page, with ascx controls.

One ASCX control loads

                this.Controls.Add(new ScriptLink()
                {
                    Name = "/layouts/15/Webpart1Control/jQuery.js",
                    Language = "javascript",
                    Localizable = false
                });

and the other ASCX control from different webpart do

                this.Controls.Add(new ScriptLink()
                {
                    Name = "/layouts/15/Webpart2SecondControl/jQuery.js ",
                    Language = "javascript",
                    Localizable = false
                });

What will be in this case and how to do correct?