Asp.Net with the code behind C#

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C#

ASP.NET

event

I am developing an ASP site with the code behind c#. I can't understand that how to write user-defined events for asp controls like panel, hyperlink and etc..
Here is My ASP Code..

<asp:HyperLink ID="signUp" runat="server" CssClass="row5"> 
     <span>SIGNUP to </span>
     <br />
     <span>SEE</span>
</asp:HyperLink> 

In the above code the 2 span's have different style so that I cant remove it.. I want to write click event for this hyperlink. I thought that it should be like the following..

<asp:HyperLink ID="signUp" runat="server" CssClass="row5" onclick="signUp_click"> 
     <span>SIGNUP to </span>
     <br />
     <span>SEE</span>
</asp:HyperLink>

The code behind..

protected void signUp_click(object sender, EventArgs e)
  {
    panel1.Visible=true;
    panel2.Visible=false;
    signUp.Visible=false;
  }

Please do help me to write event for asp controls..