per adesso ti mando la paginetta di prova che ho fatto:
nel mio caso, naturalmente, il compo vero/falso si chiama si_no
codice:
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected string ControlloStatus(bool b)
{
if (b)
return "http://..../Vero.gif";
else
return "http://..../Falso.gif";
}
protected void Page_Load(object sender, EventArgs e)
{
libreria.ModuloWeb.DataBind(this.GridView1, MioModulo.StringaConnessioneTest, "select si_no from campi", null);
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Pagina senza titolo</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<img alt='<%# ControlloStatus((bool)Eval("si_no")) %>' src='<%# ControlloStatus((bool)Eval("si_no")) %>' />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
</form>
</body>
</html>