Time stamp in VB.Net

Question

Hi I have used time stamp in vb.net like this - btnGenerateReport.Enabled = False Dim sw As Stopwatch = Stopwatch.StartNew() getreport() */ this is my function through ehich i am loading data sw.Stop() Dim ts As TimeSpan = sw.Elapsed Label1.Text = ts.TotalMilliseconds.ToString() +  ms for summary report now i am getting time in milliseconds in my label but each time milliseconds are different means first time it is 3392.2505 ms and same code when i run second time it is 3696.0097 ms. it should be same.... Please tell me is there ant error in my code or why it is different each time??? Thanks

Vulpes · Answer

You can calculate and show the average time elapsed as follows. Each time the report is generated the average time is recalculated: Protected Sub Page_Load(ByVal Sender As System.Object ByVal e As System.EventArgs) Handles Me.Load If Not IsPostBack Then Session.Item(Count) = 0 Session.Item(Total) = 0L End If End Sub Protected Sub btnGenerateReport_Click(ByVal sender As Object ByVal e As System.EventArgs) Handles btnGenerateReport.Click btnGenerateReport.Enabled = false Dim sw1 As Stopwatch = Stopwatch.StartNew() getreport() sw1.Stop() Dim ems As Long = sw.ElapsedMilliseconds Dim count As Integer = CInt(Session.Item(Count)) + 1 Dim total As Long = CLng(Session.Item(Total)) + ems Dim average As Long = total / count; Label1.Text = average.ToString() +  ms (average) Session.Item(Count) = count Session.Item(Total) = total btnGenerateReport.Enabled = true End Sub

rachayita jaiswal · Answer

Hi i am using local server only so how will i check performance in milliseconds because through this code time is keep changing..

Vulpes · Answer

When you perform a long running operation it's very unlikely that the time taken will be exactly the same on any two occasions. Instead you'll get a range of times which you should average to get a mean time. There are a number of reasons for this. For example the thread on which the code is running may be interrupted by the operating system to run another thread or (in the case of .NET) the CLR may decide to perform a garbage collection in the middle of the operation. Also if you're obtaining data from an external server the time taken for this to arrive will depend amongst other things on how busy the server is at the time of the request.