How to create event for user control

 public delegate void SignatureHandler(object sender, EventArgs e);

        public event SignatureHandler SignatureEvent;

        public delegate void SignatureJSHandler(object sender, EventArgs e);

        public event SignatureJSHandler SignatureJSEvent;

        public delegate void SendConfirmationHandler(object sender, EventArgs e);

        public event SendConfirmationHandler SendConfirmationEvent;

<uc1:DigitalSignatureButton runat="server" ID="DigitalSignatureButton" OnSignatureEvent="buttonSave_OnClick" OnSignatureJSEvent="buttonSaveJS_OnClick" />