Connection with SQL Server Part 2

As You can see in code there are some header file which is added for connecting with the sql server

the header file
Using System.Data;
And
Using System.Data.SqlClient;
Is must required so don't forget it

Sqlconnection Description:-

SqlConnection()

Initializes a new instance of the SqlConnection class.

SqlConnection(String)

Initializes a new instance of the SqlConnection class when given a string that contains the connection string.

SqlConnection(String, SqlCredential)

Initializes a new instance of the SqlConnection class given a connection string, that does not useIntegrated Security = true and a SqlCredential object that contains the user ID and password.