How to assign checkboxlist in ASP.NET web application.

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Hii..i have CheckboxList in which i have 5 checkbox-Select All,Karate,Kickboxing,Kung Fu,Yoga. I want when user checked first option "Select All" then all checkboxses selected automatically and show in label message 15000.And if user checked one by one i.e checked Karate then message shows 5000...and so on.Or user chcked if like Karate and Yoga message shows the total sume of Fees like Karate fees is 5000 and yoga fees is 3000 then it should be show 8000.
Please help me ...Thnk u

What I have tried:

protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
   {
       if (CheckBoxList1.SelectedItem.ToString() == "Select All")
       {
           Lblselected.Text = "15000";

       }
       else if (CheckBoxList1.SelectedItem.ToString() == "Karate")
       {
           Lblselected.Text = "4000";

       }
       else if (CheckBoxList1.SelectedItem.ToString() == "Kickboxing")
       {
           Lblselected.Text = "6000";

       }

       else if (CheckBoxList1.SelectedItem.ToString() == "Kung Fu")
       {
           Lblselected.Text = "3500";

       }
       else if (CheckBoxList1.SelectedItem.ToString() == "Yoga")
       {
           Lblselected.Text = "1500";

       }

       else
       {
           Lblselected.Text = "0";

       }
   }