DropDownList error in ASP.NET
<p>this is my drpdownlist </p>

<pre><code>&lt;asp:DropDownList ID="DriverGender" runat="server"&gt;
                         &lt;asp:ListItem Text="M" Value="M"&gt;&lt;/asp:ListItem&gt;
                         &lt;asp:ListItem Text="F" Value="F"&gt;&lt;/asp:ListItem&gt;
                        &lt;/asp:DropDownList&gt;
</code></pre>

<p>And from the code behind i would like to select a value from the dropdown depending on the value stored in the database. 
Code:</p>

<pre><code>DriverGender.Items.FindByValue((String)DataReaderObj["gender"]).Selected = true; 
</code></pre>

<p>But this is the recurring error i get :
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.</p>
