Windows forms remove event handler

And I also want to know how to re-attach the event handler. With the code above, the textBox1 will have a function like placeholder. Maybe you can just give me some help on how to add the placeholder to a textbox. That's what I want. Here is a solution to your problem, according to this post of mine. Windows Forms uses the EventHandlerList class to maintain control events. Every event is accessed using a simple key of type object. Keys are stored in private fields of the control.

The only way to access this data is using reflection, but we should know the name of the event key field. By decompiling the the Control class and it's descendants, we can see that the keys use different names. I extracted three common naming pattern among the keys, and used them in the GetControlEventKey method. This is the mechanism that WinForms controls use to hold the event handlers. There is no special thing about it.

It is just a design choice. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services.

Privacy policy. An event handler is a method that is bound to an event. When the event is raised, the code within the event handler is executed.

Each event handler provides two parameters that allow you to handle the event properly. Setting an event through the Visual Designer is known as handling an event at design-time. You can also handle events dynamically in code, known as handling events at run-time. An event created at run-time allows you to connect event handlers dynamically based on what your app is currently doing.

The Desktop Guide documentation for. NET 6 and. NET 5 including. NET Core 3. In Visual Studio, use the Visual Designer to manage handlers for control events. The Visual Designer will generate the handler code and add it to the event for you.

Change the Properties pane mode to Events by pressing the events button. Double-click the event to generate a new handler, it's blank if no handler is assigned. If it's not blank, this action opens the code for the form and navigates to the existing handler.

Use the selection box to choose an existing handler. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Making Agile work for data science. Stack Gives Back Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually.