public class ImageListConverter : TypeConverter { 
public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType) 
{ Collection<ImageUrl> imageList = value as Collection<ImageUrl>; if (imageList != null && destinationType == typeof(string)) { 
StringBuilder builder = new StringBuilder();builder.Append("[");bool first = true;foreach (ImageUrl imageUrl in imageList){
if(first){
first = false;}else
{builder.Append(",");}
builder.Append("\""); builder.Append(imageUrl.Url.Replace("~/", "")); builder.Append("\""); 
}builder.Append("]");return builder.ToString();
} return base.ConvertTo(context, culture, value, destinationType); } }