![]() ![]() No future control updates installed on the machine can affect it. This change means that if you have an application based purely on Windows Forms controls that you have built, tested, and deployed, you can count on the application to run on a machine without disruption. You can do this on an application-by-application basis to ensure that applications that will benefit from the updated control will use it, whereas ones that won’t benefit or that risk being broken continue to use the version of the control known to work with the application. If you want the application to pick up the latest version of the control automatically, you can change the policy for the application to cause it to do so. Instead, it continues to use the version of the control that it was originally built against. Replacing ActiveX Controls with Windows Forms Controls If an updated control becomes available on a system, the application does not automatically pick it The reason for this is that Windows Forms controls are local to each application, meaning that each application is bound to a particular version of the control. Applications that are built with Windows Forms controls do not risk being broken when you download an update for a control. The updated control might benefit some applications while breaking others. Because accepting an update for an ActiveX control is an all-or-nothing proposition, the potential for doing more harm than good is high. It’s good if the updated control fixes bugs that affect one or more of your applications, but it’s bad if the updated control introduces new bugs or incompatibilities that break your applications. This global use of controls can be good and bad. If you download an update for the ActiveX control, all of your applications automatically use the updated control. When an ActiveX control is registered on your machine, all applications in which the control is used will share the control from the same location. Improved Versioning You can think of ActiveX controls and components as being global across all applications. Windows Forms does not support the host interface SSTab is looking for, so the control cannot accept child controls when it exists on a Windows form. For example, the ActiveX SSTab control depends on a specific host interface in order to support child controls. Thus, the capabilities of the ActiveX control may degrade when placed on a Windows form. An ActiveX control may depend on functionality provided by the Visual Basic 6 environment, which does not exist in Windows Forms. For example, custom property editors are not available for ActiveX controls. NET environment, you may encounter some issues with them. Because ActiveX controls are based on COM and are not native to the. For example, a Windows Forms control can support custom property editors-such as a TreeView nodes collection editor- for use with the Property Browser. ![]() NET environment, and thus they are more tightly integrated into that environment. ![]() NET Compatibility Windows Forms controls have an inherent advantage over ActiveX controls in that they are native to the. NET compatibility, improved versioning, and simpler deployment.ġ00 Percent. As you’ll see in this section, these benefits include 100 percent Microsoft. 403īenefits of Upgrading Controls Upgrading from ActiveX controls to Windows Forms controls has certain benefits. In addition, it discusses the benefits of making this transition. This chapter discusses how you can manually replace your ActiveX controls with equivalent Windows Forms controls. In fact, as we discussed in Chapter 13, the Upgrade Wizard-except in limited situations-does not replace your ActiveX controls with equivalent Windows Forms controls, even when equivalent controls exist. Although there are many Windows Forms controls that are equivalent to the ActiveX controls you find in Visual Basic 6, you are not forced to replace all of your ActiveX controls with Windows Forms equivalents Visual Basic. NET offers a new control model called Windows Forms controls. ![]() Visual Basic 4 provided a feature that would automatically replace the VBX controls in your project with equivalent OCX controls-commonly referred to as ActiveX controls today. In order to move your Visual Basic application to 32 bits, you were forced to upgrade your VBX controls to OCX controls. Visual Basic 4 32-Bit Edition offered OCX-short for OLE control extension-replacements for most of the VBX controls delivered with Visual Basic 4 16-Bit Edition. When Visual Basic polevaulted to 32 bits, VBX-short for Visual Basic extension-controls didn’t make it over the bar and were left behind. Replacing ActiveX Controls with Windows Forms Controls If you’ve been using Microsoft Visual Basic long enough-since before Visual Basic 4, to be exact-you will have fond memories of upgrading your controls from one control model to another: from VBX to OCX. ![]()
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