[DefaultMember("Item")]

public class WorksheetCollection : WorkbookElement 

using( var doc = Workbook.Load( "test.xlsx") )   // Loads an existing Workbook named “test.xlsx”.

  {

    var worksheetA = doc.Worksheets[ 1 ];         // Gets the second worksheet. 

    var worksheetB = doc.Worksheets[ “Sheet3” ];         // Gets the worksheet named “Sheet3”. 

    doc.Worksheets.Add();                                   // Adds a new Worksheet.

    doc.Worksheets.Add( "ThirdSheet" );         // Adds a new Worksheet with a specific name.

    if( doc.Worksheets.Contains( "ThirdSheet" ) ) // Looks for a specific Worksheet.

      {

        Debug.WriteLine( "Found" );

      }

    doc.Save(); 

  }