Simple Way to Access the connection string value from web.config file

It's very simple to access the connection string in the project to establish connection from web.config file.
Here is the code
Web.config

start with "<" 'appSettings' and close with ">"
"<"add key="sqlconnstr" value="Data source=Database ServerName;database=DatabaseName;user id=UserId;password=Password;connect timeout=0;" "/>"
"" 

SqlConnection sqlconn;
sqlconn = new SqlConnection(ConfigurationManager.AppSettings["sqlconnstr"].ToString());