title: How can I get type double array from List<string>?
body: <pre><code>var array1 = (from ir in PMEC.InterestRateSet
                select new List&lt;string&gt; { ir.Tenor.ToString() }).ToList();
  
  var array2 = (from ir in PMEC.InterestRateSet
                select new List&lt;string&gt; { ir.Rate.ToString() }).ToList();
  
  array1.AddRange(array2);
  
  var array = array1.ToArray();
  </code></pre>
  
  <p>For example, <code>array1</code> has six numbers, <code>array2</code> has six numbers, then after they are combined, <code>array</code> has 12 numbers.</p>
  
  <p>Then what should I do in order to get array of type double?</p>