C / C++ / MFC

 // Create an instance of the C# class <br />
    // on the managed heap (using gcnew)<br />
    TestCSharpLib1::CSharpClass ^ csharpClass = gcnew TestCSharpLib1::CSharpClass();<br />
    <br />
    // Prepare marshal context for marshaling data between C# and C++ ( No idea what this does!)<br />
    marshal_context ^ marshalCtx = gcnew marshal_context();<br />
<br />
    //<br />
    // Marshal string from C++ (CStringW - const wchar_t *)<br />
    // to C# (System::String ^)<br />
    //<br />
	System::Double ^ d = marshalCtx->marshal_as< double >( static_cast< double >( In2 ) );<br />
<br />
    // Set string property into C# object<br />
    csharpClass->Text = d;  // THIS gives error C2664<br />

namespace TestCSharpLib1<br />
{<br />
    public class CSharpClass<br />
    {<br />
        private double _text;<br />
<br />
        public CSharpClass()<br />
        {<br />
            _text = 0;<br />
        }<br />
<br />
        public CSharpClass(double text)<br />
        {<br />
            _text = text;<br />
        }<br />
<br />
        public System.Double Text<br />
        {<br />
            get { return _text; }<br />
            set { _text = value; }<br />
        }