Input string was not in a correct format
<p>I am getting the following error on below code.</p>

<blockquote>
  <p>Input string was not in a correct format.</p>
</blockquote>

<p>Code:</p>

<pre><code>private void RefreshListType(bool forExport)
{
    grdListItems.DataSource = ListType.GetListTypes(Convert.ToInt16(cboListType.SelectedValue));
    grdListItems.DataBind();
    lblCount.InnerText = "LookUps: " + grdListItems.Rows.Count.ToString();
}
</code></pre>

<p>Please help me.</p>
