To find out who is connected to database in SQL Server

There are three ways to find who is connected to a database in sqlserver.
First one:

• Use the SQL SERVER Management Studio -- Management -- Activity Monitor
• This gives a list of users, database names, status, command, transactions, application with which they are using the database, CPU, IO and Memory usage, Login time etc.

Second One:

• Use the built in stored procedure called sp_who2
• Run the command exec sp_who2
• This gives a list of users, database names, status, command, program with which they are using the database, CPU time, Login time etc.