How to make demo(trial version) vb.net

[arkhe3]

Hello, i do a project in vb.net.
and i want to do demo(TRİAL VERSION).

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim free As Integer = Microsoft.Win32.Registry.CurrentUser.CreateSubKey("demo").GetValue("time", 5)

        Label1.Text = free& " stay days "

        hak -= 1

        If hak < 0 Then

            MsgBox("THE END please buy this programm")

            Me.Close()



        Else
            Microsoft.Win32.Registry.CurrentUser.CreateSubKey("demo").SetValue("time", free)
        End If
    End Sub

this codes are not daily. i don't want this codes....



i want trial version the days..
what can i do?

help me please....

[tlhintoq]

I'll be the one to break the bad news...
Your scheme for protecting your program via a registry entry is so simplistic that it isn't worth implementing. Just about anyone can break this 'security' with about 5 minutes of effort.

One way is to have your program require registration on a web server. You can then issue unique demo codes that will expire or unique paid codes that don't

You might also look into the various security options by companies such as Aladdin. http://www.aladdin.com/ Who have software wrappers for your applications as well as hardware security dongles.

[john greene]

Or, you could code the install date into an xml page and look for

date.today < installdate.addDays(30)
start app
else
msgbox("buy the program already cheapo")
app.close()

then when adding xml to project folder(if using professional version) mark xml as hidden