title: Highlight the null value cells in RadGridView C#
body: <p>I have a radGridView, the user inserts rows, i want to highlight the cell with null values.  For example to make the back  color of the cell Red.
  I have tried the below code, but it did not work...</p>
  
  <p>Inside a button</p>
  
  <pre><code>for (int j = 0; j &lt; radGridView1.Rows.Count; j++)
  {
        if (radGridView1.Rows[j].Cells[4].Value.ToString() == "")                
            radGridView1.Rows[j].Cells[4].Style.ForeColor = Color.Red;  
  }
  </code></pre>
  
  <p>So how to do it? or if there is a better highlight method that notifies the user for the empty cell.</p>
  
  <p>Thanks in advance</p>