asp.net mvc - use bootstrap img-circle class

 <td>
@if (item.Picture != null)
{
<img src="data:image/png;base64,
                    @Convert.ToBase64String(item.Picture,78
,item.Picture.Length-78 ,
                    Base64FormattingOptions.None)"
class="img-circle"
alt="Image" />
}
        </td>