title: Arithmetic operation resulted in an overflow. (Adding integers)
body: <p>I can't understand this error: </p>
  
  <p>In this call to method SetVolume, <strong>Volume</strong> = 2055786000 and <strong>size</strong> = 93552000. Volume is an Integer property, and size is also Integer, as you can see. </p>
  
  <p>The class is a partial class of a dbml entity class, however this Volume property is NOT a column in the database, it exist only in the partial class, as a "business object property". </p>
  
  <p><strong>View Detail</strong> shows: </p>
  
  <p><strong>Data > Item</strong> : In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user.</p>
  
  <p><img src="https://i.stack.imgur.com/HKmde.png" alt="alt text"></p>
  
  <p>What may cause this...?</p>