Problem to open Excel file

Hi,
I expect to copy details from one given Excel file into another Excel file (called New0.xlsx) by these

                using (FileStream fs = new FileStream(openFileDialog1.FileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
                {
                    using (SpreadsheetDocument doc = SpreadsheetDocument.Open(fs, false))
                    {
                        using (FileStream fs1 = new FileStream(Path0, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite))
                        {
                            using (SpreadsheetDocument doc1 = SpreadsheetDocument.Open(fs1, false))
                            {
                                WorkbookPart workbookPart = doc.WorkbookPart;

                                /*Sheet theSheet = workbookPart.Workbook.Descendants<Sheet>().
                                    Where(s => s.Name == "Sheet Overall").FirstOrDefault();*/
                                Sheet theSheet;

                                int sheetIndex = 0;
                                DocumentFormat.OpenXml.Spreadsheet.Sheets sheets = workbookPart.Workbook.Sheets;
                                //foreach (WorksheetPart wsPart in workbookPart.WorksheetParts)
                                foreach (Sheet sheet in sheets)
                                {
                                    Boolean b = CreateSpreadsheetWorkbook(Path0, sheet.Name);
                                    ...

but how to resolve this problem

System.IO.FileNotFoundException was unhandled
  HResult=-2147024894
  Message=Could not find file 'C:\dp13\New0.xlsx'.
  Source=mscorlib
  FileName=C:\dp13\New0.xlsx
  StackTrace:
       at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
       at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
       at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
       at WindowsFormsApplication2.Form1.menuItem5_Click(Object sender, EventArgs e) in c:\dp13\General Application\WindowsFormsApplication9_4_0_3\WindowsFormsApplication2\Form1.cs:line 97
       at System.Windows.Forms.MenuItem.OnClick(EventArgs e)
       at System.Windows.Forms.MenuItem.MenuItemData.Execute()
       at System.Windows.Forms.Command.Invoke()
       at System.Windows.Forms.Command.DispatchID(Int32 id)
       at System.Windows.Forms.Control.WmCommand(Message& m)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
       at System.Windows.Forms.Form.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(Form mainForm)
       at WindowsFormsApplication2.Program.Main() in c:\dp13\General Application\WindowsFormsApplication9_4_0_3\WindowsFormsApplication2\Program.cs:line 19
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException:

due to this line

using (FileStream fs1 = new FileStream(Path0, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite))

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Many Thanks & Best Regards, Hua Min