title: OleDBConnection Error in C#
body: <p>I am using C# to connect to my MS SQL database with OleDBConnection. I can log in successfully by SSMS, but not by OleDBConnection.</p>
  
  <p>I get an exception such as:</p>
  
  <blockquote>
    <p>[DBNETLIB][ConnectionOpen (Invalid Instance()).] Invalid connection.</p>
  </blockquote>
  
  <p>Below is my connection string:</p>
  
  <p><code>Provider=SQLOLEDB.1;Pemmrsist Security Info=True;Data Source=127.0.0.1;Initial Catalog=Test_DB;User ID=test;Pwd=testdb;Connect Timeout=15</code></p>
  
  <p>and I have added the <code>test</code> login.</p>