title: Can't connect Visual Studio to SQL Server database
body: <p>I use Visual Studio 2017, I connected to my database from Server Explorer:</p>
  
  <p><img src="https://i.stack.imgur.com/zSBbh.png" alt="here it is">.</p>
  
  <p>Then I added SQL connection:</p>
  
  <pre><code>var constring = @"Data Source=JSINJARA\SQLEXPRESS,Database=box,Integrated Security=SSPI";
  SqlConnection con = new SqlConnection(constring);
  </code></pre>
  
  <p>But when I try to open connection I get the following exception:</p>
  
  <p><img src="https://i.stack.imgur.com/FCRWI.png" alt="exception"></p>
  
  <p>What can be the problem?</p>