c# - Console program, static methods, socket becomes null -

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class program {     static socket m_sock;      static void main(string[] args)     {         socket m_sock= new socket(addressfamily.internetwork, sockettype.stream, protocoltype.tcp);         .         .         .         m_sock.connect(ipendlocalhost);         sendrequest("command");     }      static void sendrequest(string scommand)     {        .        .      **m_sock.send(szcommand, ibytestosend, socketflags.none);**      }

when comes send method nullreferenceexception. in debug (i added m_sock watch) see when program enters sendrequest method m_sock becomes null. can't understand why happening , problem is. please help.

m_sock defined internal main @ class level, don't have define again in main, initialize it, like: 

static void main(string[] args)     {         m_sock= new socket(addressfamily.internetwork, sockettype.stream, protocoltype.tcp);

notice socket removed.

currently main method initializing local m_sock, , why class level m_sock staying null, later when access in static method getting exception.


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