How to write code behind for hyper link tag

You would attach either the event in the code behind, or in the ASPX / ASCX of your link in question like so:

OR

 linkGoSomewhere.Click += (linkGoSomewhere_Click);

With an event handler looking like so in your code:

 public void linkGoSomewhere_Click(object sender, EventArgs e) 
 { 
 Response.Redirect("Default.aspx"); 
 }