title: How to reference Image Class in C# winforms?
body: <p>I'm making a new Project which is a class library.</p>
  <p><img src="https://i.stack.imgur.com/1cX90.png" alt="alt text" /></p>
  <p>my problem is I always got this error:</p>
  <pre><code>The type or namespace name 'Drawing' 
  does not exist in the namespace 'System' (are you missing an assembly reference?)
  </code></pre>
  <p>this is my code:</p>
  <pre><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
              {
              }
          }
      }
  }
  </code></pre>
  <p>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 <code>ReturnImage</code> which supposedly will accept an object and returns an <code>Image</code>.</p>
  <p>But why I get that error? Please help...</p>