title: NullReferenceException in string.IsNullOrWhiteSpace() and string.IsNullOrEmpty()
body: <p>I'm checking the cell values of cells of a column that might or not be empty/null so I needed something to avoid a <code>NullReferenceException</code>.</p>
  
  <p>How do I do that since even with the <code>IsNullOrWhiteSpace()</code> and <code>IsNullOrEmpty()</code> I get that exception somehow.</p>
  
  <p>Here's part of the code I'm using:</p>
  
  <pre><code>s = "Total = " + dataGridView1.Rows[0].Cells.Count +
      "0 = " + dataGridView1.Rows[0].Cells[0].Value.ToString() +
      "/n  1 = " + dataGridView1.Rows[0].Cells[1].Value.ToString() +
      "/n  2= " + dataGridView1.Rows[0].Cells[2].Value.ToString() +
      "/n  3 = " + dataGridView1.Rows[0].Cells[3].Value.ToString() +
      "/n  4= " + dataGridView1.Rows[0].Cells[4].Value.ToString() +
      "/n  5 = " + dataGridView1.Rows[0].Cells[5].Value.ToString() +
      "/n  6= " + dataGridView1.Rows[0].Cells[6].Value.ToString() +
      "/n  7 = " + dataGridView1.Rows[0].Cells[7].Value.ToString();
  
      if (string.IsNullOrEmpty(dataGridView1.Rows[0].Cells[8].Value.ToString()))
      {
  
      }
      else
      {
          s += "/n  8 = " + dataGridView1.Rows[0].Cells[8].Value.ToString();
      }
  </code></pre>
  
  <p>I've tried those methods I've tried putting it <code>==null</code>, I've tried <code>!=null</code>. What else is there or what am I doing wrong exactly and how do I do it right?</p>