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How can we create custom controls in ASP.NET?

Posted By :Jack Smith     Posted Date :October 05, 2012    Points :40   Category :ASP.Net 
Basic steps to create a Custom control:

1. Create Control Library
2. Write the appropriate code
3. Compile the control library
4. Copy to the DLL of the control library to the project where this control needs to be used
5. The custom control can then be registered on the webpage as any user control through the

You can also find related Interview Question to How can we create custom controls in ASP.NET?  below: 

Can I create your own custom templates in Sharepont?

  
Yes you can. You can have templates for business plans, doctor's office, lawyer's office, Educational, health etc and if you want to share with anyone else in SharePint community you can upload your own SharePoint templates to Microsoft website. (More...)

What are custom controls?

  
Custom controls are compiled code components that execute on the server, expose the object model, and render markup text, such as HTML or XML, as a normal Web Form or user control does. (More...)

What base class do custom Field Controls inherit from?

  
This varies. Generally, custom field controls inherit from the Microsoft.SharePoint.WebControls.BaseFieldControl namespace, but you can inherit from the default field controls.
(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.
(More...)

Can I create custom templates?

  
Yes you can. You can have templates for business plans, doctor's office, lawyer's office etc. (More...)

How do you create a Custom action for an item in a list ?

  

Ans. This can be done by adding a new feature into SharePoint. You would need to use customaction tag in your elements.xml file and will have to set various properties like imageurl or UrlAction for your customaction. You can later add this feature into sharepoint using stsadm install feature command. (More...)


What base class do custom Field Controls inherit from?

  


This varies. Generally, custom field controls inherit from the Microsoft.SharePoint.WebControls.BaseFieldControl namespace, but you can inherit from the default field controls.
(More...)


Can I create custom templates?

  

Yes you can. You can have templates for business plans, doctor's office, lawyer's office etc.
(More...)

Which is mandatory Content Placeholders Create Custom Master Page in SharePoint?

  
The Below Content Placeholders are required for backwards Compatibility:-

? PlaceHolderTitleLeftBorder
? PlaceHolderPageImage
? PlaceHolderMiniConsole
? PlaceHolderTitleRightMargin
? PlaceHolderTitleAreaSeparator
? PlaceHolderNavSpacer
? PlaceHolderLeftNavBarBorder
? PlaceHolderBodyLeftBorder
? PlaceHolderBodyRightMargin
(More...)

How do you create a Custom action for an item in a list ?

  
This can be done by adding a new feature into SharePoint. You would need to use customaction tag in your elements.xml file and will have to set various properties like imageurl or UrlAction for your customaction. You can later add this feature into sharepoint using stsadm install feature command. (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 is Private Constructor? and it's use? Can you create instance of a class which has Private Constructor?

  
When a class declares only private instance constructors, it is not possible for classes outside the program to derive from the class or to directly create instances of it. (Except Nested classes)
Make a constructor private if:

1) You want it to be available only to the class itself. For example, you might have a special constructor used only in the implementation of your class' Clone method.

2) You do not want instances of your component to be created. For example, you may have a class containing nothing but Shared utility functions, and no instance data. Creating instances of the class would waste memory. (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...)

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