i have a class called "Print" and in that i have a method called "printfile". and i have to call that method in prolog .net file.

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C#

.NET

i have a class called "Print" and in that i have a method called "printfile". and i have to call that method in prolog .net file.

here is the sample code:

public class Print
{
       public Print()
       {
           //code
       }
       public static void printfile(string at)
       {
           StreamWriter w = new StreamWriter("c:\filetest.txt", true);
           w.WriteLine(at);
           w.Close();
       }
}

then i convert this class in .dll and uses in prolog .net class.

prolog .net class:

assembly('print.dll').

:-class('Test').


testfile:-'Print'::'printfile'('test').

but when i execute this it gives error "Object reference is not set to an instance of an object"

please tell me what should i do...