How to Resolve 'ExecuteReader requires an open and available Connection' Errors in ASP.NET?

solve the problem of "ExecuteReader needs to be opened and available" problem

In the ASP.NET application, the concurrent connection may be caused by the "connection" state due to the underlying connection. This mainly occurs when using static connection string and connection.

The performance and synchronization of static connection

Static connection will affect performance by bypassed the Ado.NET connection pool mechanism. The connection pool optimizes performance by using a set of activities for each configuration. If the connection is not turned off, it will accumulate the useful connection, which may exceed the maximum pool size and cause abnormalities.

In addition, the static connection creates a single lock for all threads that visit them in a multi -threaded environment such as ASP.NET. This can cause performance problems and may cause abnormalities you encounter.

Best practice

In order to solve this problem and improve performance and reliability, please follow the following best practice:

Avoid reusing or ado.net objects.

Do not make the connection statement static.

• Create, open, use, close, and release connections within the function range of their functions.
• Use the "USING" statement to automatically release and close the connection.
Code Reconstruction Example

The following is a reconstruction example of the "RetrievePromotion" method that conforms to the best practice:

By following these criteria, you can build a reliable and efficient data access layer for your ASP.NET application.

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