title: How to add 2 columns in SSRS expressions with calculation?
body: <p>I have a table <code>customerTrans</code> with two columns <code>order_date</code> as DateTime, and <code>days_of_arrival</code> as Int. I need to make an expression to display the expected date like: </p>
  
  <pre><code>(order_date+days_of_arrival) = expected_date
  </code></pre>
  
  <p>For example, if <code>customer order_date</code> is 12/15/2015 and <code>days_of_arrival</code> = 7
  I need to show the <code>expected_date</code> as 12/22/2015.</p>
  
  <p>I used the <code>DateAdd()</code> function in my expression but it doesn't work for me. </p>
  
  <pre><code>=DateAdd("d", sum(days_of_arrival), Fields!payment_date)
  </code></pre>
  
  <p>How can I calculate the expected date?</p>