唉，最后一步了！
C# winform程序在公司测试没有任何问题，到客户现场安装老是弹出一个错误提示"Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.",网上说是数据库连接没关闭，可是我组查了代码，每一个连接数据库的类中都关闭了数据库连接，都用了 using (SqlConnection con = SqlHelper.GetConnection())
try
{
con.Open();
string cmdSelect = "select room_id,bed_Name,sickName,sex,NurLevel,illState,Cared,Wcfs from BASE_BED where hushisiteID='" + Init.GetHushisiteIdByIp() + "'order by room_id,bed_Name";
using (SqlCommand cmd = new SqlCommand(cmdSelect, con))
{
using (SqlDataReader dr = cmd.ExecuteReader())
{....
.}
}
}这类语法，可是软件运行时间久了还是会出现上面的错误，请教各位高手。
[解决办法]
使用了DataReader,你即使离开Using语句块,连接还是被保持着,否则DataReader怎么读取数据?
[解决办法]
(SqlDataReader dr = cmd.ExecuteReader())
对 这里 少个参数
using (SqlDataReader readerTemp = cmdTemp.ExecuteReader(CommandBehavior.CloseConnection))
[解决办法]
最简单的办法：把所有的con.Open();换成下面这句
if (con.State==ConnectionState.Closed) con.Open();
[解决办法]
