using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication4
{
    class Program
    {
        public class Members
        {

            private int posX;

            private int posY;

            private int posZ;

            public Members()
            {
                this.posX = 0;
                this.posY = 0;
                this.posZ = 0;
            }

            public Members(int x, int y)
            {
                this.posX = x;
                this.posY = y;
                this.posZ = 0;
            }

            public Members(int x, int y, int z)
            {
                this.posX = x;
                this.posY = y;
                this.posZ = z;
            }

            public int Pos_x
            {
                get
                {
                    return this.posX;
                }
                set
                {
                    this.posX = value;
                }
            }

            public int Pos_y
            {
                get
                {
                    return this.posY;
                }
                set
                {
                    this.posY = value;
                }
            }

            public int Pos_z
            {
                get
                {
                    return this.posZ;
                }
                set
                {
                    this.posZ = value;
                }
            }

            public void MoveBy(int x, int y, int z)
            {
                this.posX = (this.posX + x);
                this.posY = (this.posY + y);
                this.posZ = (this.posZ + z);
            }

            public void SetBy(int x, int y, int z)
            {
                this.posX = x;
                this.posY = y;
                this.posZ = z;
            }

            public string GetString()
            {
                return (\"x:\"
                            + (this.posX.ToString() + (\", y:\"
                            + (this.posY.ToString() + (\", z:\" + this.posZ.ToString())))));
            }
        }

    }
}

오류가 나네요..
C#클래스만든거에요..
제가 1학년이라서 허접이라서 소스를 봐도 모르겠네요..

에러 네용은
오류 1 진입점에 적합한 정적 \'Main\' 메서드가 \'C:\\Documents and Settings\\바탕 화면\\ConsoleApplication4\\ConsoleApplication4\\obj\\Debug\\ConsoleApplication4.exe\' 프로그램에 없습니다. ConsoleApplication4