Image inside div tag

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ASP.NET2

Hi,
I have
form tag
<div class="editor-field" id="div_Img" runat="server">
<asp:image src=" ">

Getting error:
Error 1 'TestingPMO_RR.Controllers.Appreciation_CardController.VerifyRenderingInServerForm(System.Web.UI.Control)': no suitable method found to override

private string DivToHtml(HtmlGenericControl hgc)
       {
           StringBuilder sb = new StringBuilder();
           StringWriter sw = new StringWriter(sb);
           HtmlTextWriter hw = new HtmlTextWriter(sw);
           hgc.RenderControl(hw);
           return sb.ToString();
           //div_Img
       }
 public override void VerifyRenderingInServerForm(Control control)
     {


     }