VB Helper: Tip: Use code regions to simplify VB .NET code. Simple Singleton Forms. Introduction When I started with VB.NET a few years ago, one of the things I missed was how to deal with forms where you only want one instance open at the same time.
I read a lot of articles concerning Singleton forms etc, which was all complicated and the result was not easy to use. At the end I found a very simple way to do this. Maybe too easy ! Solution The trick is realy very simple. Public Class clsGlobals #Region "Singleton Forms" Public Shared frmStockSelection As frmStockSelection Public Shared frmSettings As frmSettings #End Region End Class These public shared variables will be usable eveywhere in your code. Determining Checked Items in the Windows Forms CheckedListBox Control. BindingNavigator Location. Multiple Forms in VB.NET. Part 1. Closing Forms In VB.NET - VB.NET. Visual Basic Event Sub Parameters - Sender and e in VB.NET Event Subroutines. In VB6, an event subroutine, like Button1_Click, was much less complicated because the system called the subroutine strictly by name.
If a Button1_Click event existed, the system called it. It's direct and straightforward. But in VB.NET, there are two major upgrades that make VB.NET SOOPercharged. (That's "OOP" for Object Oriented Programming.) The "Handles" clause controls whether the system calls the subroutine, not the name.
Let's look at a simple example to see the difference that parameters make in VB.NET. Private Sub Button1_Click( ByVal sender As System.Object, ByVal e As System.EventArgs ) Handles Button1.Click ' Your code goes here End Sub Event subroutines always receive a "sender" object and a system EventArgs parameter "e". Button As IntegerShift As IntegerX As SingleY As Single When more advanced mice came out with more buttons, VB6 had a real problem supporting them. LeftMiddleRightNoneXButton1XButton2. Tool, Menu, and Status Strips—The ToolStripContainer at C# Online.NET (CSharp-Online.NET)
So far, the ToolStrip examples you’ve seen have used docked ToolStrip objects.
This is a quick way to build simple forms, and it’s ideal if you intend to have only a single ToolStrip visible. However, there’s another option—you can embed your ToolStrip inside a ToolStripContainer. The ToolStripContainer allows more than one docked ToolStrip control to share space. For example, imagine you create a control with three ToolStrip objects. If you dock them all to the top, they appear in three separate rows, one above the other, depending on the order in which you created them. But what do you do if you want more than one ToolStrip control appear on the same row, side by side but similarly docked to the top edge?
Essentially, the ToolStripContainer is a group of five panels. Figure 14-8. When the ToolStripContainer is first created, these four panels are hidden. Figure 14-9 shows a ToolStripContainer with several identical ToolStrip objects. Operating System Version. The following table summarizes the most recent operating system version numbers.
To determine the best way to test for a feature, refer to the documentation for the feature of interest. The following list discusses some common techniques for feature detection: If you must require a particular operating system, be sure to use it as a minimum supported version, rather than design the test for the one operating system. This way, your detection code will continue to work on future versions of Windows. Community Network Forums: Read Before Posting - Where to find ... Before posting you should look through the various resources below for the answers to your questions.
A lot of the "how to" questions are already answered in the material below. Search the Forums Use the search feature in these forums to see if your question has already been answered. SDK Libraries Crystal Reports for Visual Studio 2010 - [reference page| [Developer Guide| [API Reference| Crystal Reports 2008 - [reference page| [Developer Guide| [API Reference| see Microsoft KB article [902225 | if you have problems viewing this help guide [Crystal Reports XI R2| Crystal Reports 10, Not available online. Programming - in-depth tutorials, code and podcasts.