Why does the check for an interface fail?
<p>I have a class that implements an interface. In another area of the code I check if that class instance contains that interface, but it doesn't work. The check to see if the class contains the interface always fails (false) when it should be true. </p>

<p>Below is a simple representation of what I am trying to accomplish. </p>

<p>Example</p>

<pre><code>  public interface IModel
    {
        bool validate();
    }


  public class SomeModel : IModel
    {
        public SomeModel
        {
        }

        public bool Validate()
        {
            return true;
        }        
    }



    // Dummy method
    public void Run()
    {
        SomeModel model = new SomeModel();

        if (model is IModel)
        {
           string message = "It worked";
        }
        else
        {
            string message = "It failed";
        }
    }
</code></pre>
