Problem to line

Hi,

                        Excel.Worksheet sheet2 = Book0.WorkbookPart.Workbook.Descendants<Sheet>().Where(s => s.Name == "Sheet Overall");

Error	2	Cannot implicitly convert type 'System.Collections.Generic.IEnumerable<DocumentFormat.OpenXml.Spreadsheet.Sheet>' to 'Microsoft.Office.Interop.Excel.Worksheet'. An explicit conversion exists (are you missing a cast?)	C:\App\WindowsFormsApplication6\WindowsFormsApplication2\Form1.cs	117	50	WindowsFormsApplication2

Many Thanks & Best Regards, Hua Min