C# control cannot fall through from one label ('case ２ :' ) to another 问题

switch (request.downloadDimension)
{
case 1:
sqlselect.Append(“ctripmasterhotelid”);　
break;
case 2:
sqlselect.Append(“supplierid,suppliername,ctripmasterhotelid”);　　
case 3:
sqlselect.Append(“supplierid,suppliername”);　
break;　
default:
sqlselect.Append(“zone,zonename”);
sqlGroupby.Append(“zone,zonename”);
break;
}
今天写了这样一段代码，编译的时候报错　说

control cannot fall through from one label (‘case ２ :’ ) to another

仔细检查后　发现　　
　　case 2语句块后面没有跟break;（罪过～～罪过～～）

所有童鞋们再写switch case 语句的时候，case 后面有语句块的情况下，一定要写ｂｒｅａｋ！！！