i try to display image,not getting right.can some1 find out, what's wrong in my codding ?

hello i m new to xamarin
i m trying to fetch images from sql server database into xamarin project.
i explain u below the steps i followed to fetch the data from web server.....

i stored image into sql server database field name is Img and datatype is varbinary(max).
i created webapi to fetch the data form sql database

i have used byte[] property for image in class (class Name is Products) as below

public int pro_Id {get;set;}
public String ProductName {get;set;}
public String Description {get;set;}
public byte[] img {get;set;}

i am reading img field using sqldatareader (Reader.Read()) as below

while (Reader.Read()) in MasterContorller
{
product.Pro_id = Convert.ToInt32(Reader["Pro_id"]);
product.ProductName = Reader["ProductName"].ToString();
product.Description = Reader["Description"].ToString();
Products.img = (byte[]).Reader("img");
}

lets talk about what the steps i followed in my xamarin project to fetch the data

i used url (i.e - http:/xyz.com/api/master/getproducts)to retrieve the data from web server using json converter.
it fetches me data (productname,Description) in listview... but not retrieving the image

below the class (Product) i created in xamarin project....

public int pro_Id {get;set;}
public String ProductName {get;set;}
public String Description {get;set;}
public byte[] img {get;set;}

i bind them as below in xaml

<ContentPage.Resources>
    <ResourceDictionary>
        <conv:ByteArrayToImageSourceConverter x:Key="bic" />
    </ResourceDictionary>
</ContentPage.Resources>

it retrieves ProductName and Description well it leaves the space for image but not displaying it.

this is the code below i use to convert byte into image

public class ByteArrayToImageSourceConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{

        ImageSource retSource = null;
        if (value != null)
        {
            byte[] imageAsBytes = (byte[])value;
            retSource = ImageSource.FromStream(() => new MemoryStream(imageAsBytes));
        }
        return retSource;
    }
    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

i m struggling a lot with this.... i don't know where i m making the mistake
i tried all possible ways to find out the issue but unable to do so...
if anyone can help me find out the actual issue...
thanks