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What are user controls?

Posted By :Syed Shakeer Hussain     Posted Date :August 22, 2010    Points :10   Category :ASP.Net 
User controls are custom, reusable controls, and they use the same techniques that are employed by HTML and Web server controls. They offer an easy way to partition and reuse common user interfaces across ASP.NET Web applications. They use the same Web Forms programming model on which a Web Forms page works

You can also find related Interview Question to What are user controls?  below: 

Can I use user controls and third-party controls including ActiveX controls in WPF?

Windows Forms user controls will work the same as the standard Windows Forms controls, which means you can certainly use them in WPF applications. As far as third-party controls go, it depends on how these controls are built. If they are built as managed Windows Forms custom controls they will also work fine in this scenario. If they are built as ActiveX controls they can also be used in a WPF application as long as they are contained within a WindowsFormsHost control. Since Windows Forms already has support for hosting ActiveX controls, all you need to do is generate the managed wrappers for the ActiveX control and then use those wrappers to instantiate the control and host it within the WindowsFormsHost control on a WPF window or page. One handy way to do this is to simply create a Windows Forms user control that contains the ActiveX control and then simply host the user control in the WindowsFormsHost control. (More...)

What are the differences between user and custom controls?

User controls are easier to create in comparison to custom controls, however user controls can be less convenient to use in advanced scenarios.
User controls have limited support for consumers who use a visual design tool whereas custom controls have full visual design tool support for consumers.
A separate copy of the user control is required in each application that uses it whereas only a single copy of the custom control is required, in the global assembly cache, which makes maintenance easier.
A user control cannot be added to the Toolbox in Visual Studio whereas custom controls can be added to the Toolbox in Visual Studio.
User controls are good for static layout whereas custom controls are good for dynamic layout.

Define User Controls Class?

User Controls are created by the user and are based on the class UserControl (System.Windows.Forms.UserControl). User controls too have properties, methods and events. (More...)

What is the difference between custom controls and user controls

Custom controls are basically compiled code i.e. DLLs. These can be easily added to toolbox, so it can be easily used across multiple projects using drag and drop approach. These controls are comparatively hard to create.

But User Controls (.ascx) are just like pages (.aspx). These are comparatively easy to create but tightly couple with respect to User Interface and code. In order to use across multiple projects, we need to copy and paste to the other project as well. (More...)

What are server controls?

ASP.NET server controls are components that run on the server and encapsulate user-interface and other related functionality. They are used in ASP.NET pages and in ASP.NET code-behind classes. (More...)

What are the requirements to create a CLR based user-defined type?

CLR must be enabled for the instance and A class created with a CLR-compatible language. (More...)

What are the privileges that can be granted on a table by a user to others?

Insert, update, delete, select, references, index, execute, alter, all (More...)

What is a user control?

An ASP.NET user control is a group of one or more server controls or static HTML elements that encapsulate a piece of functionality. A user control could simply be an extension of the functionality of an existing server control(s) (such as an image control that can be rotated or a calendar control that stores the date in a text box). Or, it could consist of several elements that work and interact together to get a job done (such as several controls grouped together that gather information about a user's previous work experience). (More...)

What is the difference between login controls and Forms authentication?

Login controls are an easy way to implement Forms authentication without having to write any code. For example, the Login control performs the same functions you would normally perform when using the FormsAuthentication class—prompt for user credentials, validate them, and issue the authentication ticket—but with all the functionality wrapped in a control that you can just drag from the Toolbox in Visual Studio. Under the covers, the login control uses the FormsAuthentication class (for example, to issue the authentication ticket) and ASP.NET membership (to validate the user credentials). Naturally, you can still use Forms authentication yourself, and applications you have that currently use it will continue to run. (More...)

What is different between Web User Control and in Web Custom Control?

Web user controls : Web User Control is Easier to create and another thing is that its support is limited for users who use a visual design tool one gud thing is that its contains static layout one more thing a seprate copy is required for each application.

Web custom controls: Web Custom Control is typical to create and gud for dynamic layout and another thing is it have full tool support for user and a single copy of control is required because it is placed in Global Assembly cache. (More...)

How many types of validation controls are provided by ASP.NET ?

There are six main types of validation controls:-

RequiredFieldValidator: It checks whether the control have any value. It's used when you want the control should not be empty.

RangeValidator: It checks if the value in validated control is in that specific range.

CompareValidator: It checks that the value in controls should match the value in other control.

RegularExpressionValidator: When we want the control value should match with a specific regular expression.

CustomValidator: It is used to define UserDefined validation.

ValidationSummary: It displays summary of all current validation errors. (More...)

Where is image data loaded into ImageList controls actually stored in the project?

Each form has an associated resource file (with a .resx extension) where image data and localized strings are stored.You can see this by clicking the Show All Files icon in the Solution Explorer. (More...)

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