Visual Basic

Dim timeOne As DateTime = DateTime.Parse("2004-01-14T12:00:00")
Dim timeTwo As DateTime = DateTime.Parse("2004-01-14T23:00:00")

Dim totalTime As TimeSpan

totalTime = New TimeSpan(timeOne.TimeOfDay.Ticks + timeTwo.TimeOfDay.Ticks)

messagebox.show(totaltime.tostring)

form2.Show()
Me.Close()

' Event Level... where Thread is created
Dim t As New Thread(AddressOf DisplayFile)
t.Start()
ReDim Preserve th(th.Length + 1)
th(th.Length) = t

You can add one or more worksheets to the Worksheets collection by using the collection's Add method. The Add method returns the new Worksheet object. If you add multiple worksheets, the Add method returns the last worksheet added to the Worksheets collection. If the Before or After arguments of the Add method are omitted, the new worksheet is added before the currently active worksheet. The following example adds a new worksheet before the active worksheet in the current collection of worksheets:
Dim wksNewSheet As Excel.Worksheet

Set wksNewSheet = Worksheets.Add
With wksNewSheet
   ' Work with properties and methods of the
   ' new worksheet here.
End With
You use the Worksheet object's Delete method to delete a worksheet from the Worksheets collection. When you try to programmatically delete a worksheet, Microsoft® Excel will display a message (alert); to suppress the message, you must set the Application object's DisplayAlerts property to False, as illustrated in the following example:
Function DeleteWorksheet(strSheetName As String) As Boolean
   On Error Resume Next
   
   Application.DisplayAlerts = False
   ActiveWorkbook.Worksheets(strSheetName).Delete
   Application.DisplayAlerts = True
   ' Return True if no error occurred;
   ' otherwise return False.
   DeleteWorksheet = Not CBool(Err.Number)
End Function
Note   When you set the DisplayAlerts property to False, always set it back to True before your procedure has finished executing, as shown in the preceding example.
You can copy a worksheet by using the Worksheet object's Copy method. To copy a worksheet to the same workbook as the source worksheet, you must specify either the Before or After argument of the Copy method. You move a worksheet by using the Worksheet object's Move method. For example:
Worksheets("Sheet1").Copy After:=Worksheets("Sheet3")
Worksheets("Sheet1").Move After:=Worksheets("Sheet3")
The next example illustrates how to move a worksheet so that it is the last worksheet in a workbook:
Worksheets("Sheet1").Move After:=Worksheets(Worksheets.Count)