title: What's the equivalent of InStr for an array(2 dimension) in c#
body: <p>I'm new to c#, if I don't explain what I need very well please tell me.
  I'm reading some data from an excel file and then store the data into an array. </p>
  
  <pre><code>excel.Application x1app = new excel.Application();
          x1app.Visible = true;
          excel.Workbook x1workbook = x1app.Workbooks.Open(@"...");
          x1workbook.Activate();
          excel.Worksheet x1worksheet = x1workbook.Worksheets[1];
          excel.Range x1range = x1worksheet.UsedRange;
          System.Array myvalues;
          myvalues = (System.Array)x1range.Cells.Value;
  </code></pre>
  
  <p>Now I want to use equivalent  for <code>InStr</code> from <code>VBA</code> on the array, but I don't know what's the equivalent.</p>
  
  <p>I have tried <code>Array.IndexOf(myvalue, "")</code>, but this work's only for one dimension array.</p>