public class Program 
{
void Main(string[] args)
    {
        Console.WriteLine("Welcome, Miracle He");
        Console.ReadLine();
    }
}

int i = 0, age = 28; 
var i = 0, age = 28;//与上等同
public abstract void Write(string name);

public class Test
{
public void MethodA()
    {
int n = 0;//n只在此方法中有效
        Console.WriteLine(str);//输出test
    }
public void MethodB()
    {
        n = 1;//此时n已失效
    }
string str = "test";//字段可先使用后声明
}

public class Test 
{
static int x = 5;
public static void TestStatic()
    {
int x = 10;
        Console.WriteLine(x);//输出10
        Console.WriteLine(Test.x);//输出5
    }
string y = "test";
public void TestInstance()
    {
string y = "test1";
        Console.WriteLine(y);//输出test1
        Console.WriteLine(this.y);//输出test
    }        
}