超时时间已到。在从池中获取连接之前超时时间已过？
超时时间已到。在从池中获取连接之前超时时间已过？
老是连接池超时，是连接池没有关闭！
我是个新手，请问下，各位大哥大姐，在哪里解决他的关闭问题，还不能改变原有的类，谢谢了！由于帖子不能太长，我就分成两段！

using   System;
using   System.Configuration;
using   System.Data;
using   System.Data.SqlClient;
using   System.Collections;
namespace   GdVnet.GdVnetClass
{
public   class   W_SqlHelper
{
public   SqlCommandBuilder   updatebuilder;  
public   W_SqlHelper()
{
}
public   static   readonly   string   CONN_STRING1=   ConfigurationSettings.AppSettings[ "ConnectionString1 "];
public   static   readonly   string   CONN_STRING2=   ConfigurationSettings.AppSettings[ "ConnectionString2 "];
private   static   Hashtable   parmCache   =   Hashtable.Synchronized(new   Hashtable());
public   static   DataSet   tablesDs=new   DataSet();  
public   static   int   ExecuteNonQuery(string   connString,   CommandType   cmdType,   string   cmdText,   params   SqlParameter[]   cmdParms)  
{
SqlCommand   cmd   =   new   SqlCommand();
using   (SqlConnection   conn   =   new   SqlConnection(connString))  
{
PrepareCommand(cmd,   conn,   null,   cmdType,   cmdText,   cmdParms);
int   val   =   cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return   val;
}
}
public   static   int   ExecuteNonQuery(SqlConnection   conn,   CommandType   cmdType,   string   cmdText,   params   SqlParameter[]   cmdParms)  
{
SqlCommand   cmd   =   new   SqlCommand();

PrepareCommand(cmd,   conn,   null,   cmdType,   cmdText,   cmdParms);
int   val   =   cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return   val;
}
public   static   int   ExecuteNonQuery(SqlTransaction   trans,   CommandType   cmdType,   string   cmdText,   params   SqlParameter[]   cmdParms)  
{
SqlCommand   cmd   =   new   SqlCommand();
PrepareCommand(cmd,   trans.Connection,   trans,   cmdType,   cmdText,   cmdParms);
int   val   =   cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return   val;
}
public   static   SqlDataReader   ExecuteReader(string   connectionString,   CommandType   commandType,   string   commandText)
{
return   ExecuteReader(connectionString,   commandType,   commandText,   (SqlParameter[])null);
}
public   static   SqlDataReader   ExecuteReader(string   connString,   CommandType   cmdType,   string   cmdText,   params   SqlParameter[]   cmdParms)  
{
SqlCommand   cmd   =   new   SqlCommand();
SqlConnection   conn   =   new   SqlConnection(connString);
try  
{
PrepareCommand(cmd,   conn,   null,   cmdType,   cmdText,   cmdParms);
SqlDataReader   rdr   =   cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();

return   rdr;
}
catch  
{
conn.Close();
throw;
}
}
public   static   DataSet   ExecuteDataset(string   connectionString,   CommandType   commandType,   string   commandText)