What is the role of the SqlConnection object in ADO.NET?

The SqlConnection object is responsible for opening a connection to a SQL Server

database. It represents the physical connection to the data source and must be open before

executing commands (like SqlCommand) or reading data (using SqlDataReader or

SqlDataAdapter).

Example:

SqlConnection connection = new SqlConnection(connectionString);

connection.Open();

// Execute database commands

connection.Close();