title: Design Pattern For "Load Format Save Data"
body: <p>I need to acomplish things like loading data from xls source (ole db), formatting it according to specification of output file, merging proccessed fields, then saving it to csv.</p>
  
  <p>How to handle multiple fields of data that must be of certain type? Formatted in certain way - etc.</p>
  
  <p>I have a hard time abstracting class structure for this problem.</p>
  
  <p>What design pattern would suit me best? </p>