title: 'ddCountries' has a SelectedValue which is invalid because it does not exist in the list of items
body: <pre><code>&lt;asp:DropDownList runat="server" ValidationGroup="SaveInformation" ID="ddCountries"&gt;                                            
  &lt;/asp:DropDownList&gt;
  </code></pre>
  
  <p>Code Behind: Countries with ID and Name are coming in DataTable</p>
  
  <pre><code>ddCountries.DataSource = new  GeneralStatic().GetAllCountries();
  ddCountries.DataTextField = "Name";
  ddCountries.DataValueField = "ID";
  ddCountries.DataBind();
  ddCountries.Items.Insert(0, "-- Select Country --");
  </code></pre>
  
  <p>It was working fine before now throwing error</p>
  
  <blockquote>
    <p>'ddCountries' has a SelectedValue which is invalid because it does not
    exist in the list of items.</p>
  </blockquote>