ArgumentException caught while trying to enter connection string

Question

I am trying to develop a very simple Student Enrollment System, and as I built and compiled my solution, an ArgumentException was caught near my connection string. The exception message displayed is this:

Keyword not supported: '@datasource'.

I checked for inner exceptions and the exception details, but found nothing that can give me the slightest of hint about the reason behind this exception.

What am I doing wrong??? Is it syntactical error??? Or did I get my connection string wrong???? Can anyone point it out please????

Here's my code where the exception is getting caught:

    #region Database Connection
    public SimpleEnrollmentSystem()
    {
        InitializeComponent();

        //creating a connection
        connection = new SqlConnection();
        command = connection.CreateCommand();
        connection.ConnectionString = "@DataSource = SAADMAAN;" +
            "Initial Catalog=db_student;User ID=sa;Password=***********";

        updateReady = false;
        insertReady = false;   
    }
    #endregion

I also have a database named db_student in SQL Server 2012. The only table I have there is named Students, which is structured in the following way:

  CREATE TABLE Students
  (
  StudentID int unique primary key,
  FirstName varchar(50),
  LastName varchar(50),
  Gender varchar(10),
  Age int,
  Address varchar(MAX)
  )

Note that I'm using Visual Studio 2012 and MS SQL Server 2012.

Answer 1

try:

 connection.ConnectionString = @"Data Source = SAADMAAN;" +
            "Initial Catalog=db_student;User ID=sa;Password=***********";

EDIT :

Be sure to leave a space beetween Data and Source and @ out of string literal

Answer 2

尝试使用：

 connection = new SqlConnection("data source=SAADMAAN;initial catalog=db_student;User ID=sa;Password=***********");