Excel - Autofill entire formula column easily

Let us take the following example. Now you need to add NUMBER1 and NUMBER2 and display the total. you guys already know its very simple only. just place the cursor on C2 and type =A2+B2 (OR) you can use autosum option but for applying the formula to the entire column there is a simple method. first find total of C2 using above formula or Autosum then place the cursor on the black dot on the C2 cell and double click on the black dot thats it!!!..