Timeout period elapsed prior to obtaining a connection from the pool - asp.net

Question

I am getting following error after hosting the application:
Error Page : http://********.in/Presentation Layer/NewQuotation.aspx
Error Message : 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.
StackTrace : at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource1 retry, DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource1 retry, DbConnectionOptions userOptions)
at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource1 retry)
at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
at System.Data.SqlClient.SqlConnection.Open()
at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetNewOpenConnection()
at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetOpenConnection(Boolean disposeInnerConnection)
at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(DbCommand command)
at DataLayer.Quotation_DL.insertQuoteproduct(QuotationProductCombination _objQP) in F:\gayathri reddy\Enq Quote\06-01-2015\DataLayer\Quotation_DL.cs:line 430
at BusinessLayer.Quotation_BL.insertQuoteproduct(QuotationProductCombination _objQpc) in F:\gayathri reddy\Enq Quote\06-01-2015\BusinessLayer\Quotation_BL.cs:line 88
at EngQuote.Presentation_Layer.NewQuotation.Quotationsave(Int32 status, String oper) in F:\gayathri reddy\Enq Quote\06-01-2015\EngQuote\Presentation Layer\NewQuotation.aspx.cs:line 3711
But while running the code in local Visual Studio 2010 there is no issues, when i host it in server or local machine IIS or Shared hosting server on that time only we are facing this issue
I have tried following all these steps but have not got any improvement
1).Opened and closed the connection in every DL function
2).Increased the command time out in this way
DbCommand cmd = db.GetStoredProcCommand("Procedurename");
cmd.CommandTimeout = int.MaxValue;
SqlDataReader sdata = (SqlDataReader)db.ExecuteReader(cmd);
3). Increased connection time out in web config
4). Increased executionTimeout in web config
5). Increased shutdown time out
6). Changed debug=false
but no use,connection time out problem still exists for long processes
Please suggest any solution other than above options
Expecting a good solution for this issue from u peoples
thanks in advance....

Answer 1

I guess connection between IIS and SQL Server was too slow to serve a connection. Just make sure the max connection limit is not reached. You can confirm by executing below select statement.
SELECT
DB_NAME(dbid) as DBName,
COUNT(dbid) as NumberOfConnections,
loginame as LoginName
FROM
sys.sysprocesses
WHERE
dbid > 0
GROUP BY
dbid, loginame
You can try increasing pool size in connection string. But this will have some downside. Below is the sample connection string with increased pool size.
server=localhost;database=dbname;uid=username;pwd=paswrd;Max Pool Size=200;