title: Why creating an NUnit project into my solution it use an old version of .NET framework (2.1)?
body: <p>I am pretty new in <strong>C#</strong> and <strong>.NET</strong> and I have the following problem.</p>
  
  <p>I created a <strong>NUnit</strong> (version <strong>3.10.1</strong>) project in my solution. The thing that I can't understand is: why the framework version is the <strong>2.1</strong>? Is not a very old version? If I try to change it I obtain older version, I am attaching a screenshot:</p>
  
  <p><a href="https://i.stack.imgur.com/mdzsI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mdzsI.png" alt="enter image description here"></a></p>
  
  <p>The strange thing is that the other project into my solution uses the <strong>.NET 4.5.2</strong> framnework version.</p>
  
  <p>Why this NUnit project is using an old framework version? there is a way to update it?</p>
  
  <p>What is wrong or what am I missing?</p>