Question

I’m making a new Project which is a class library.

my problem is I always got this error:

The type or namespace name 'Drawing' 
does not exist in the namespace 'System' (are you missing an assembly reference?)

this is my code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;

namespace ClassLibrary1
{
    public class Class1
    {
        public void ReturnImage(object imageStream)
        {
            try
            {
                byte[] data = (byte[])imageStream;
                MemoryStream ms = new MemoryStream(data);
                return Image.FromStream(ms);
            }
            catch
            {
            }
        }
    }
}

I’m planning to use this class to serve as a repository of common methods that I will be reusing in my program. In the above code, I have a public method ReturnImage which supposedly will accept an object and returns an Image.

But why I get that error? Please help…

Answer 1

Add reference to System.Drawing

From VS menu: Project > Add Reference

And to save you from incessant typing of: using namespacehere;

Press Ctrl+. (Control and .), it will automatically insert using namespacehere; on top of your code based on the classes you use. Example, place the cursor on any character inside Image of Image.FromStream, then press Ctrl+., it will automatically insert using System.Drawing; on top of your code. Likewise, do the same(pressing Ctrl+.) on FromStream of Image.FromStream, it will automatically insert using System.IO; on top of your code