Accessing user controls from the code-behind

When you add a user control to an ASP.NET page, Visual Studio .NET does not add a control declaration as it does when you add standard ASP.NET web controls. The result is that you can’t directly access the user control from the code-behind and programmatically change its properties and call its methods. Well, you can, but you first have to declare the user control variable by hand, and then set it to the user control instance created on the page. Here’s the code:

' declare the controlProtected MyCtl As MyUserControl Private Sub Page_Init(sender As Object, e As EventArgs) Handles MyBase.Init    InitializeComponent()    ' get a reference to the MyUserControl user control.    MyCtl = DirectCast(FindControl("MyCtl"), MyUserControl)End Sub 

From now on you can access the control and do something like:

MyCtl.BackColor = Color.YellowMyCtl.DoSomething()

If you program with C#, you still need to manually declare the control variable, but you don’t need to explicitly set it to the control instance declared on the ASPX page. This is done automatically by the ASP.NET runtime, provided that the name of the control variable matches the name used for the control instance on the page.

Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

The Latest

Top 5 B2B SaaS Marketing Agencies for 2023

In recent years, the software-as-a-service (SaaS) sector has experienced exponential growth as more and more companies choose cloud-based solutions. Any SaaS company hoping to stay ahead of the curve in this quickly changing industry needs to invest in effective marketing. So selecting the best marketing agency can mean the difference

technology leadership

Why the World Needs More Technology Leadership

As a fact, technology has touched every single aspect of our lives. And there are some technology giants in today’s world which have been frequently opined to have a strong influence on recent overall technological influence. Moreover, those tech giants have popular technology leaders leading the companies toward achieving greatness.

iOS app development

The Future of iOS App Development: Trends to Watch

When it launched in 2008, the Apple App Store only had 500 apps available. By the first quarter of 2022, the store had about 2.18 million iOS-exclusive apps. Average monthly app releases for the platform reached 34,000 in the first half of 2022, indicating rapid growth in iOS app development.