title: Use string[][] with ngpsql
body: <p>Its not supported? I get an exception when trying to insert data with command parameter set as: </p>
  
  <pre><code>var parameter = ((IDbDataParameter)cmd.Parameters[index]);
  var list = (string[][])value;
  parameter.Value = list;
  </code></pre>
  
  <p>With message</p>
  
  <blockquote>
    <p>System.NotSupportedException: This .NET type is not supported in Npgsql or your PostgreSQL: System.String[][]</p>
  </blockquote>
  
  <p>I'm using PostgreSQL 9.4 and created a column with type <code>text[][]</code>. Since <code>text[]</code> maps to <code>string[]</code> without any issues, I can't see a reason why two dimensional arrays are not working.</p>