title: OpenXML SDK returning a number for CellValue instead of cells text
body: <p>I am using the Open XML SDK to open an Excel xlsx file and I try to read the cellvalue on position A1 in each sheet.
  I use the following code:</p>
  
  <pre><code>using (SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Open(openFileDialog1.FileName, false))
  {
      var sheets = spreadsheetDocument.WorkbookPart.Workbook.Descendants&lt;Sheet&gt;();
  
      foreach (Sheet sheet in sheets)
      {
          WorksheetPart worksheetPart = (WorksheetPart)spreadsheetDocument.WorkbookPart.GetPartById(sheet.Id);
          Worksheet worksheet = worksheetPart.Worksheet;
  
          Cell cell = GetCell(worksheet, "A", 1);
  
          Console.Writeline(cell.CellValue.Text);
       }
  }
  
  private static Cell GetCell(Worksheet worksheet, string columnName, uint rowIndex)
  {
       Row row = GetRow(worksheet, rowIndex);
  
       if (row == null)
           return null;
  
       return row.Elements&lt;Cell&gt;().Where(c =&gt; string.Compare
                 (c.CellReference.Value, columnName +
                 rowIndex, true) == 0).First();
  }
  
  // Given a worksheet and a row index, return the row.
  private static Row GetRow(Worksheet worksheet, uint rowIndex)
  {
      return worksheet.GetFirstChild&lt;SheetData&gt;().
            Elements&lt;Row&gt;().Where(r =&gt; r.RowIndex == rowIndex).First();
  } 
  </code></pre>
  
  <p>The text in the first worksheet on position A1 is simply 'test' however, in my console I see the value '0' as cell.CellValue.Text</p>
  
  <p>Does anyone have an idea to get the correct value of the cell?</p>