一、忽略转义字符

string fileName = "D:\\文本文件\\text.txt";

string fileName = @"D:\文本文件\text.txt";

二、让字符串跨行

string strSQL = "SELECT * FROM HumanResources.Employee AS e"+ " INNER JOIN Person.Contact AS c"+ " ON e.ContactID = c.ContactID"+ " ORDER BY c.LastName";

string strSQL = @"SELECT * FROM HumanResources.Employee AS eINNER JOIN Person.Contact AS cON e.ContactID = c.ContactIDORDER BY c.LastName";

三 、C#是不允许关键字作为标识符(类名、变量名、方法名、表空间名等)使用的，但如果加上@之后就可以了。

public static void @static(int @int){if (@int > 0){System.Console.WriteLine("Positive Integer");}else if (@int == 0){System.Console.WriteLine("Zero");}else{System.Console.WriteLine("Negative Integer");}          
}