c++ - How to define constructor outside the class in c# -

i new c# , switched c++ c#. doing in c++:

class {  public : a(char *argv);//declaration of constructor } 

then in main doing this:

int main(int argc, char **argv) {  obj(argv[1]); }  

then definition of constructor :

a::a(char * argv)  {  //here use command line argument argv contains file. } 

i tried write equivalent code in c# follows:

using system; using system.io; using system.collections.generic; using system.linq; using system.text;  namespace shekhar_final  {     class huffman      {     public  int data_size,length,i,is_there, total_nodes;     string code;     huffman(char  *args);     }          public   huffman(char  *args) //called myclass  line:16         {             using (var stream = new binaryreader(system.io.file.openread(args[0])))  //line : 18             {                 while (stream.basestream.position < stream.basestream.length)                 {                     byte processingvalue = stream.readbyte();                 }             }         }      public class myclass      {         public static void main(string[] args)         {                 huffman objsym =new huffman(args);//object creation         }     } }// line:34 

the couple of errors got ://i have indicated line corresponding errors in code

shekhar_c#.cs(16,25): error cs1525: unexpected symbol `huffman', expecting `class', `delegate', `enum', `interface', `partial', or `struct' shekhar_c#.cs(18,33): error cs1530: keyword `new' not allowed on namespace elements shekhar_c#.cs(18,36): error cs1525: unexpected symbol `binaryreader', expecting `class', `delegate', `enum', `interface', `partial', or `struct' shekhar_c#.cs(18,79): warning cs0658: `value' invalid attribute target. attributes in attribute section ignored shekhar_c#.cs(34,1): error cs8025: parsing error compilation failed: 4 error(s), 1 warnings 

could please me in writing c# equivalent of c++ (removing these errors). guidance welcome because beginner c#.

c# requires constructors defined within class:

using system; using system.io; using system.collections.generic; using system.linq; using system.text;  namespace shekhar_final {     public class huffman{      public  int data_size,length,i,is_there, total_nodes;     string code;       public   huffman(string[]  args) //called myclass  line:16      {          using (var stream = new binaryreader(system.io.file.openread(args[0])))  //line : 18          {              while (stream.basestream.position < stream.basestream.length)              {                  byte processingvalue = stream.readbyte();              }          }       }     }     public class myclass     {        public static void main(string[] args)        {                 huffman objsym =new huffman(args);//object creation        }    } }// line:34