cannot connect unity to sql server 2012

Hello,

I am now to unity and i wan to make sql server 2012 connection. So i installed the sql server 2012 and made a successful connection using C# in a windows form application.

So I made some researches to make it in unity, and i got the following Code:

 // Connect to database
     public   void openSqlConnection() {
         Debug.Log("Connecting to database...");
         string connectionString = "Server=127.0.0.1;" +
                         "Port=1433;" +
                         "Database=mydatabase;" +
                         "User ID=userId;" +
                         "Password=mypass;" +
                         "Pooling=False;";
                         
                  
                          
         dbConnection = new MySqlConnection(connectionstring);
         dbConnection.Open();
         Debug.Log("Connected to database.");
     }

When i call this function to open the connection i get this error :

 Exception: Exception of type 'System.Exception' was thrown.
 MySql.Data.MySqlClient.NativeDriver.Open ()
 Rethrow as MySqlException: Unable to connect to any of the specified MySQL hosts.
 MySql.Data.MySqlClient.NativeDriver.Open ()
 MySql.Data.MySqlClient.Driver.Create (MySql.Data.MySqlClient.MySqlConnectionStringBuilder settings)

The problem is that the connection using a windows form application is successful but using c# in unity isn't.

So help me please!! thanks!