You’re using a new instance of System.Random every time. Random is seeded by the current time. Initializes a new instance of the Random class, using a time-dependent default seed value Reference Since you are creating new instances in very quick succession, they get the same seed. Instead, you should use the same instance of Random, … Read more
You can use the Process class to run a batch file Dim psi As New ProcessStartInfo(“Path TO Batch File”) psi.RedirectStandardError = True psi.RedirectStandardOutput = True psi.CreateNoWindow = False psi.WindowStyle = ProcessWindowStyle.Hidden psi.UseShellExecute = False Dim process As Process = Process.Start(psi)
Typically, a value of false is represented by 0 and a value of true is represented by any non-0 integer value. The specific value for true and false (among others) are things that you shouldn’t rely on – they can potentially be implementation specific. I’m not sure what you are trying to do, but it … Read more
The purpose of the BackgroundWorker class is to perform work on a non-GUI thread while the GUI remains responsive. Unless you set Control.CheckForIllegalCrossThreadCalls to false (which you shouldn’t do), or use Invoke as suggested in the other answers (which I also wouldn’t recommend), you’re going to get an illegal cross-thread operation exception. If you want … Read more
Ah ha. I have long wondered about this and even reading a two inch thick book on VBA basically says don’t use it unless you want to use the Find feature of the VBE to easily find calls in large projects. But I just found another use. We know that it’s possible to concatenate lines … Read more
My.Settings is a feature that enables you to manage your application’s settings such as; the last location and size of a form, the last selected properties of controls, recently opened files, …etc. It’s not – as already commented above – a place to store and retrieve your objects’ data. Your data should be in a … Read more
The main problems (set Option Strict On to find more): You can’t access the UI objects from a thread different than the UI Thread. The error you receive is: Cross-thread operation not valid:Control lblFileSizeD accessed from a thread other than the thread it was created on Then, the same error for lblDownloadedBytesD. Also, you are … Read more
Consider serialization. For this, a class is more in order than an old fashioned Struct: <Serializable> Class Animal Public Property Name As String Public Property Coloring As String Public Property VaccinesUpToDate As Boolean Public Property Species As String Public Property DateOfBirth As DateTime Public ReadOnly Property Age As Integer Get If DateOfBirth <> DateTime.MinValue Then … Read more
You will have to read all lines up to the one you’re interested in. For example: Function ReadLineWithNumberFrom(filePath As String, ByVal lineNumber As Integer) As String Using file As New StreamReader(filePath) ‘ Skip all preceding lines: ‘ For i As Integer = 1 To lineNumber – 1 If file.ReadLine() Is Nothing Then Throw New ArgumentOutOfRangeException(“lineNumber”) … Read more
Controls in .NET are just normal objects so you can freely put them into normal arrays or lists. The special VB6 construct of control arrays is no longer necessary. So you can for example say, Dim buttons As Button() = { Button1, Button2, … } For Each button As Button In Buttons button.Text = “foo” … Read more