title: Error: must have a body because it is not marked abstract extern or partial
body: <p>I have the below code and I keep getting error must have a body because it is not marked abstract extern or partial.</p>
  
  <pre><code>public interface Shape{
      int GetArea();
  }
  public class shape:Shape{
      int height;
      int width;
      int radius;  
      int GetArea();
  
  }
  class Rectangle :Shape{
      int height;
      int width;
      Rectangle(int height,int width){
          this.height = height;
          this.width = width;
      }
      int GetArea(){
          int area = height*width;
          return area;
      }
  }
  </code></pre>