C#语句先后顺序对程序的结果有影响吗

using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 namespace Test
 {
  /// <summary>
  /// 自定义类，封装加数和被加数属性
  /// </summary>
  class MyClass
  {
   private int x = ;      //定义int型变量，作为加数
   private int y = ;      //定义int型变量，作为被加数
   /// <summary>
   /// 加数
   /// </summary>
   public int X
   {
    get
    {
     return x;
    }
    set
    {
     x = value;
    }
   }
   /// <summary>
   /// 被加数
   /// </summary>
   public int Y
   {
    get
    {
     return y;
    }
    set
    {
     y = value;
    }
   }
   /// <summary>
   /// 求和
   /// </summary>
   /// <returns>加法运算和</returns>
   public int Add()
   {
    return X + Y;
   }
  }
  class Program
  {
   static void Main(string[] args)
   {
    MyClass myclass = new MyClass(); //实例化MyClass的对象
    myclass.X = ;     //为MyClass类中的属性赋值
    myclass.Y = ;     //为MyClass类中的属性赋值
    int kg = myclass.Add();
    Console.WriteLine(kg); //调用MyClass类中的Add方法求和
    Console.ReadLine();
   }
  }
 }

public class TestDoWhile 
{
 static void Main () 
 {
  int x = 0;
  do 
  {
    Console.WriteLine(x);
    x++;
  } while (x < 10);
 }
}
/*

class ForTest 
{
 static void Main() 
 {
  for (int i = 1; i <= 10; i++)
  {
   Console.WriteLine(i);
  }
 }
}
/*

for (; ; )
{
 // ...
}

 class ForEachTest
 {
  static void Main(string[] args)
  {
   int[] barray = new int[] { 0, 1, 2, 3, 4, 5};
   foreach (int i in barray)
   {
    System.Console.WriteLine(i);
   }
  }
 }
 /*

 class WhileTest 
 {
  static void Main() 
  {
   int n = 1;
   while (n < 5) 
   {
    Console.WriteLine(n);
    n++;
   }
  }
 }
 /*