title: Microsoft.Office.Interop.Excel.SpreadsheetGear does not contain a definition for Active cell and no extension method for active cell
body: <p>I get this error when I want to change from <strong>AxMicrosoft.Office.Interop.Owc11</strong> to <strong>Microsoft.Office.Interop.Excel</strong> , from <strong>AxSpreadsheet currentSpreadSheet = GetTestSheet</strong> to <strong>SpreadsheetGear IWorkbook = GetWorkbook</strong></p>
  
  <blockquote>
    <p>'Microsoft.Office.Interop.Excel.SpreadsheetGear' does not contain a definition for 'ActiveCell' and no extension method 'ActiveCell' accepting a first argument of type 'Microsoft.Office.Interop.Excel.SpreadsheetGear' could be found (are you missing a using directive or an assembly reference?)</p>
  </blockquote>
  
  <p>There is an error at ActiveCell</p>
  
  <pre><code>Object searchRange = IWorkbook.ActiveCell.Cells[1, 1];
  </code></pre>