Error - Unable to cast object of type 'System.Web.UI.WebControls

Question

Hi

  I am getting error - Unable to cast object of type 'System.Web.UI.WebControls.HiddenField' to type 'System.IConvertible'.

HiddenField hdfDate = ((HiddenField)e.Item.FindControl("hdfDate"));

<asp:HiddenField ID="hdfDate" runat="server" Value='<%# Eval("SessionDate") %>' />

Thanks