title: How to Compare two range's Range.Value2 with C#
body: <p>Here is my code</p>
  
  <pre><code>using Excel = Microsoft.Office.Interop.Excel;
  Excel.Range col1 = r1.Columns[i];
  Excel.Range col2 = r2.Columns[j];
  </code></pre>
  
  <p>Is there a quick method for me to compare above two range's value2？</p>