C# and .NET Framework interview questions:- What is Multi-targeting in .NET?

Multi-targeting: - Multi-targeting is the ability to specify the version of the
.NET Framework that your application requires to run and have the matching
experience while developing it with Visual Studio’s Integrated Development
Environment (IDE).

Visual Studio 2010 multi-targeting enables you to take advantage of the latest
enhancements to Visual Studio without having to upgrade Web sites or Web
services to the latest version of the .NET Framework. This lets you use Visual
Studio 2010 to maintain and develop your Web applications that use earlier
versions of the .NET Framework.

Let’s see a small demonstration on Multi-targeting.

Create a new project as following diagrams.




As you can see that we have selected ASP.NET Web Application which is
targeting the .NET Framework 4.0 with this project, Visual Studio 2010 will
automatically filter the toolbox controls and all the properties which are
supported in .NET framework 4.0.


Now, let’s see which are the toolbox controls and the properties are available
while selecting the .NET Framework 4.0.




Similarly, let’s see when we add reference what the version is been used
currently.




As you can see in the above diagram the current version is 4.


Now, let’s see how we change the .NET Framework 4.0 to 2.0.


As soon as you click on properties a new window will open like below window
from that select the .NET Framework to 2.0.






As soon as you change the .NET Framework to 2.0, Visual Studio 2010 will
automatically filter the toolbox controls and shows only those controls that are
shipped in .NET Framework 2.0.


As you can see that few of the control are not available now in the toolbox
as we have seen in .NET Framework 4.0 toolbox.

Similarly, let’s see what happen when add reference.







Now, you can see that the current version used is 2.

So, multi-targeting enables you to take advantage of the latest enhancements to
Visual Studio without having to upgrade Web sites or Web services to the latest
version of the .NET Framework.


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