VB.NET + Static Variables

I'm having a problem retaining values in static variables. I'll go to debug the program and have a breakpoint at a button. Of course the value in static variables is supposed to remain there after it has left this subroutine but it doesn't. I was just wondering if there is anything I'm doing wrong here or how you retain data in variables after they leave function scope. Thanks.

Try below code:

Shared start_time As DateTime
Shared stop_time As DateTime

Private Sub cmdNewRecord_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdNewRecord.Click

Dim elapsed_time As TimeSpan

If Me.cmdNewRecord.Text = "New Record" Then
Me.txtComments.Text = ""
start_time = Now
Me.cmdNewRecord.Text = "Save"
Else
stop_time = Now
elapsed_time = stop_time.Subtract(start_time)
Me.txtComments.Text = _
elapsed_time.TotalSeconds.ToString("0.000000")
Me.cmdNewRecord.Text = "New Record"
End If
End Sub

Static <> Shared in VB.Net.

Shared is more analogous to C#/C++ static. Static in VB.Net is a little... special. Static members in a function are scoped to the function, in that they are not accessible outside the function. Therefore you debugger shouldn't be able to see them. They should be available (with their previous values) on the next function call, however.

You could of course also declare them outside the function (scoped to the class) as vgangal suggests. However, if you do that they shouldn't be declared as Shared anymore. Just make them private. The advantage to keeping them in the function is that then they are guaranteed to be threadsafe.

You might also want to consider using System.Diagnostics.StopWatch rather than DateTime.Now for this.

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