Mats Lycken development

.NET and web related blog posts

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ASP.NET 101 - Part 2: Sending event data in your custom events

One of the key benefits of encapsulating logic and behavior in a user control is that the user of the control doesn’t have to care about the inner workings of the control. We only need to expose the things that the users of the control needs.

We will demonstrate this by creating a simple user registration control. The control will expose an event, UserCreated, which will contain the newly created user as data.

This way the page that the user control is located in doesn’t need to care about what fields the user needs to fill out or how the person is created. It is simply handed a user that was created.

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ASP.NET 101 - Part 1: Communication from User control to Page in ASP.NET

User controls are great for encapsulating both behavior and look. When you have some UI elements that you want to use in more than one place a User control is a great way to add reusability.

One problem that you can run into is how you add communication from the user control to the web page. Perhaps you have a button in a user control, and when you click it the web page should perform some action. If the button was on the page we would simply bind to the Clicked event on the button, but when it’s inside of the user control we don’t have access to the button.

Luckily it is really easy in .NET to add your own events. In this really simple example we will create a user control with a button that also has an event, ButtonClicked. We will then create a page that contains an instance of the user control and bind to the exposed event so that the page will know when the button has been clicked.

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