Explain the concept of Connection Pooling in ADO.NET.

Connection Pooling is a technique used to optimize the performance of database

connections in ADO.NET. When an application opens a connection to a database, the

connection is not always closed immediately. Instead, it is placed in a connection pool for

reuse by future requests. This avoids the overhead of repeatedly opening and closing

connections to the database.

Key Points:

• When a connection is closed, it is not actually destroyed. Instead, it is returned to

the pool, making it available for reuse.

• Connection Pooling is managed automatically by ADO.NET; developers do not

need to handle the pool directly.

• Connection pooling works by maintaining a pool of database connections for reuse.

When a connection is needed, one is retrieved from the pool; when it is no longer

needed, it is returned to the pool.

Benefits:

• Reduces the overhead of opening and closing database connections.
• Improves application performance by reusing existing connections.

Example:

// The connection string should have pooling enabled by default

string connectionString =
"Server=myServerAddress;Database=myDataBase;Integrated
Security=True;Pooling=True;Max Pool Size=100;";

// Use SqlConnection as usual

SqlConnection connection = new SqlConnection(connectionString);

connection.Open();

The Pooling=True in the connection string ensures that the connections are pooled.