How To Call IronPython functions in C#? -

i having problem in calling python functions in c# form. passed references. still python functions inaccessible. please me out.

using ironpython; using ironpython.hosting; using microsoft.scripting; using microsoft.scripting.hosting; using microsoft.scripting.utils;  namespace converter { public partial class form1 : form {     public form1()     {         initializecomponent();         m_scope = m_engine.createscope();         m_engine.executefile(@"c:\users\salman\desktop\lengthvolume.py");         m_engine.executefile(@"c:\users\salman\desktop\lengthvolume.py", m_scope);          object lengthvolume =m_engine.operations.invoke(m_scope.getvariable("lengthvolume"));          m_engine.operations.invokemember(lengthvolume, "f_i", new object[0]);         action f_i2 = m_engine.operations.getmember<action>(lengthvolume, "f_i");         f_i2();     }      private scriptengine m_engine = python.createengine();     private scriptscope m_scope = null;      private void button21_click(object sender, eventargs e)     {         if (combobox9.selecteditem.equals("feet"))         {             if (combobox10.selecteditem.equals("inches"))             {                 // python functions not accessible here             }         }       } 

python functions in python class

class lengthvolume(object):      def f_i(self, a):         return * 12      def f_k(self, a1):         return a1 * 0.0003048