Onserverclick not sending the event

i was just playing with html codes ,i was trying this
Html code:

<
 //submit Button

C# Code:

protected void MySubmitHandler(object sender, EventArgs args)
        {
           
            ResultLabel.InnerText="Thanks for clicking :)";
        }

ResultLable:

[Result will be displayed here]

The onclickserver is not working and not sending any event,no result is being displayed??
and i know this can be done using some other ways i.e. javascript,asp.net controls