The timeout period elapsed prior to obtaining a connection from the pool

If you are working with .NET applications, at some time you might get the below (or similar) 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.

 

Why you get the connection pool timeout error

The most probable reason you are getting the above error message, is that your application opens connection to the database without closing them. This situation is then repeated and after a number of times, the application throws an exception because it cannot open more than a given number (max pool) of connections to the database.

The best practice is to let .NET do the connection handling for you by running your SQL queries with the “using” statement. Here’s a C# example:
using (SqlConnection conn = new SqlConnection(connString))
   {
      SqlCommand cmd = new SqlCommand("SELECT @@VERSION", conn);
      conn.Open();      
      SqlDataReader dr = cmd.ExecuteReader();
      //process the result
      dr.Close();
   }
}

 

There is a useful MSDN blog article  (a little old but the principle is the same), which has more info about this type of connection handling in .NET.

 


Get the help you need for getting started with .NET Programming!

Check our online course titled .NET Programming for Beginners: Windows Forms (C#)
(special limited-time discount included in link).

.NET Programming for Beginners: Windows Forms (C#) - Online Course
(Lifetime access, certificate of completion and more!)

Learn how to implement Windows Forms projects in .NET using Visual Studio and C#, how to implement multithreading, how to create deployment packages and installers for your .NET Windows Forms apps using ClickOnce in Visual Studio, and more! 

Many live demonstrations and downloadable resources included!

Enroll Now with Discount!


 

Featured Online Courses:

 

Check our other related .NET articles:

 

Read also:

 

Subscribe to our newsletter!

Check our latest software releases!

Easily generate SQL code snippets with Snippets Generator!

Convert static T-SQL to dynamic and vice versa with Dynamic SQL Generator.

Secure your SQL Server instances with DBA Security Advisor.

 

Rate this article: 1 Star2 Stars3 Stars4 Stars5 Stars (2 votes, average: 5.00 out of 5)

Loading...

Reference: SQLNetHub.com (https://www.sqlnethub.com)

© SQLNetHub



The timeout period elapsed prior to obtaining a connection from the pool Click to Tweet