c# - Entry point in class file - More than 1 entry point -

what trying create project learn c# , have new class in project each euler problem.

so have base program.cs file has entry point.

using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks;  namespace euler {     class program     {         static void main(string[] args)         {         }     } } 

however defining entry point in own class correctly , have error showing have more 1 entry point.

how should set entry correctly?

using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks;  namespace euler {     //problem 1     //if list natural numbers below 10 multiples of 3 or 5, 3, 5, 6 , 9. sum of these multiples 23.     //find sum of multiples of 3 or 5 below 1000.      class problem1     {         public problem1(int args)         {             int num = 0;             int limit = 1000;             int sum = 0;             while (num < limit)             {                 if ((num % 3 ==0 )|| (num % 5 == 0))                 {                     sum = sum + num;                     num++;                 }                 else                 {                     num++;                 }             }             console.writeline(sum);         }     }   } 

i know newbie thing doesn't seem obvious.

error   1   program 'c:\users\sayth\documents\visual studio 2013\projects\euler\euler\obj\debug\euler.exe' has more 1 entry point defined: 'euler.program.main(string[])'.  compile /main specify type contains entry point.    c:\users\sayth\documents\visual studio 2013\projects\euler\euler\program.cs 11  21  euler error   2   program 'c:\users\sayth\documents\visual studio 2013\projects\euler\euler\obj\debug\euler.exe' has more 1 entry point defined: 'euler.problem1.main(string[])'.  compile /main specify type contains entry point.   c:\users\sayth\documents\visual studio 2013\projects\euler\euler\problem1.cs    15  21  euler 

edit have resolved entry point errors, code below doesn't work other reasons not related question.

class problem1     {         public int sum53(int args)         {             int num = 0;             int limit = 1000;             int sum = 0;             while (num < limit)             {                 if ((num % 3 == 0) || (num % 5 == 0))                 {                     sum = sum + num;                     num++;                 }                 else                 {                     num++;                 }             }             return sum;         }          public string myvalue(string args)         {             console.writeline("this total :" + );         }     } } 

you can have single entry point in program (unless tell compiler otherwise 1 use). entry point can call whatever want. if wanted have multiple different entry functions experimenting with, can uncomment function want run.

static void main(string[] args) //you can't have other functions signature in project {     function1(args);     //function3(args);     //function2(args); }  static void function1(string[] args) { }  static void function2(string[] args) { }  static void function3(string[] args) { }