Store Image in .resx as byte[] rather than Bitmap

Alternatively, right click on your .resx file and click "View Code".

Edit the XML resource item to use System.Byte[] like this:

<data name="nomap" type="System.Resources.ResXFileRef, System.Windows.Forms">
   <value>..\Resources\nomap.png;System.Byte[]</value>
</data>

Save and you should be able to use Byte[] instead of Bitmap

Try using an "Embedded Resource" instead

So lets say you have a jpg "Foo.jpg" in ClassLibrary1. Set the "Build Action" to "Embedded Resource".

Then use this code to get the bytes

byte[] GetBytes()
{
    var assembly = GetType().Assembly;
    using (var stream = assembly.GetManifestResourceStream("ClassLibrary1.Foo.jpg"))
    {
        var buffer = new byte[stream.Length];
        stream.Read(buffer, 0, (int) stream.Length);
        return buffer;
    }
}

Or, alternatively, if you want a more re-usable method

byte[] GetBytes(string resourceName)
{
    var assembly = GetType().Assembly;
    var fullResourceName = string.Concat(assembly.GetName().Name, ".", resourceName);
    using (var stream = assembly.GetManifestResourceStream(fullResourceName))
    {
        var buffer = new byte[stream.Length];
        stream.Read(buffer, 0, (int) stream.Length);
        return buffer;
    }
}

and call

 var bytes = GetBytes("Foo.jpg");

Give the jpeg file a different extension, such as "myfile.jpeg.bin". Visual studio should then treat it as binary file and the generated designer code will return byte[].