WinForms: How to handle DataGridViewButtonColumn click event

There’s not a direct way to handle the DataGridViewButtonColumn button click event. Instead, you have to: Handle the DataGridView.CellContentClick event. Check if they clicked the button column. Execute the button click handling logic, passing in the bound data item. In this article I’ll show a step-by-step example of how to handle the button click. Example … Read more WinForms: How to handle DataGridViewButtonColumn click event

C# – Use SemaphoreSlim for throttling threads

When you have multiple threads trying to do work at the same time, and you want to throttle how many of them are actually executing, you can use SemaphoreSlim. Example – a busy grocery store Grocery stores have a limited number of checkout lanes open. Let’s say the grocery store has two lanes open, and … Read more C# – Use SemaphoreSlim for throttling threads

WinForms: How to check if another form is open

If you’re working on a Windows Forms project and need to know which forms are open, use: This gives you an IEnumerable collection of form objects that are currently open. You can lookup a form by name, by type, or loop through the list. Example scenarios There are many scenarios where you’d want to know … Read more WinForms: How to check if another form is open

Event-driven .NET: How to add an event to a class

In the previous article we saw how events work. In this article I’ll show how to add an event to a class. In order to illustrate this I’ve created a simple chat app that uses an in-memory message queue. Each chat window is subscribed to the message queue’s OnMessageReceived event, and updates their UI upon … Read more Event-driven .NET: How to add an event to a class

Event-driven .NET: how events work

The very basis of event-driven programming is the concept of events. Events are an implementation of the Observer Pattern. With the Observer Pattern you have an observable entity and entities that want to observe that entity. Objects with events are observable, and other objects subscribe to those events and are notified when the events happen. … Read more Event-driven .NET: how events work