title: Using EPPlus how can I generate a spreadsheet where numbers are numbers not text
body: <p>I am creating a spreadsheet from a <code>List&lt;object[]&gt;</code> using <code>LoadFromArrays</code></p>
  
  <p>The first entry of the array is a title, the other entries are possibly numbers, text or dates (but the same for each array in the list).</p>
  
  <p>The generated Excel sheet has the green triangle warning that numbers are formatted as text.</p>
  
  <p>I loop through all the cells and set their format to Number like so <code>ws.Cells[i, j].Style.Numberformat.Format = "0";</code></p>
  
  <p>However the problem remains and I still see the green warning, even though the number format is set to number when I look in the <code>Format Cell...</code> dialogue.</p>
  
  <p>What are my options here? It is possible for me to know a bit more about what type is in each column, but how do I then set a column title? </p>
  
  <p>Is there a better solution than EPPlus? or some more post processing of the spreadsheet I can do before downloading it?</p>