C#_if else语句 

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if else 语法
    if(<test>)
            <code executed if <test> is true>//满足条件执行段段
    else
            <code executed if <test> is false>//不满足条件执行这段

如果if和else要执行的代码有多行，要加上{}组成一个块
    if(<test>)
    {
            <code1 executed if <test> is true>
            <code2 executed if <test> is true>
    }
    else
    {
            <code1 executed if <test> is false>
            <code2 executed if <test> is false>
    }

##实例

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _20
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = Console.ReadLine();
            int num1 = Convert.ToInt32(str);
            if (num1 > 50)
            {
                num1++;
                Console.WriteLine("大于50");
            }
            else
            {
                num1--;
                Console.WriteLine("小于50");
            }

            Console.ReadKey();

        }
    }
}