title: calculating cost of items listed in a listbox in Vb.net
body: <p>I've got a project on VB.net. I want to create a simple app that adds the price of every item on my list box 
  which are </p>
  
  <p>item            quantity</p>
  
  <p>car.              1000</p>
  
  <p>boats.           3000</p>
  
  <p>bikes.            700</p>
  
  <p>hats.             49</p>
  
  <p>and give me an answer in a textbox</p>
  
  <p>I added 1 listbox, 1 button, and 1 text box
  I populated the list box with the items above 
  I want to sum the quantity of these items how can I do that ?
  please I m new to VB.net</p>