Help with unmanaged code

I would be grateful if you could help me with my problem.

I have created a dll using C++  .net 2003 which contents a class of  methods.

Furthermore, i have created a gui application using microsoft visual C# 2008 exrpess edition.

I would like to use two class methods of the dll described before.

Therefore i have developed the following code in C# ( it takes an input string and returns void as output)

[DllImport("retrieval.dll", EntryPoint = "initialize")]
        [return: MarshalAs(UnmanagedType.BStr)]
        public static extern void initialize([MarshalAs(UnmanagedType.BStr)] string xml);

The code above responds to c++ dll as
void SIMPLE_RETRIEVAL::initialize(const char *param_xml)

In addition, i have developed a second method (it takes a string as input and returns an array of longs)  

The C# code that will respond to C++ dll method is
long* SIMPLE_RETRIEVAL::parse_query_and_retrieve(const char *image)

However i didn't managed to call this method above from C#....

How i could do this ?

Furthermore, when i call the first method

private string xml = "C:\retrieval_parameters.xml";

 private void InitializeComponent()
        {
                  this.initialize(this.xml);
                  ....
                  ....
         }
from the C# code
 
I take the following error :
Member 'WindowsFormsApplication1.Form2.initialize(string)' cannot be accessed with an instance reference; qualify it with a type name instead

Since i am newbie i would really appreciate your assistance!

Furthermore would i have any problems in C# if the C++ dll that i ve created has other dll dependencies.

Thank you

Best Regards

Comadreja 82
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