What Database Information Applies to What Connection String Attributes

Question

I am attempting to deploy my ASP .NET MVC 4.5 website to my server. I have all the Database details and my connection string written.

But I am unsure if my Connection String attributes are correct and if I have any the wrong way around. I am especially confused whether Data Source represents the database name or instance and whether Initial Catalog is my server or something else?

Given my database information below, is my connection string correct? I am uploading my files to my server now so I haven't had a chance to test it yet.

DB Server: mssql.mywebsite.com
DB Instance: .\MSSQLSERVER2014
DB Name: DB_mydatabase
DB User: myUserName
DB Password: myPassword

<add name="MyName"
     connectionString="Data Source=.\MSSQLSERVER2014;
                       AttachDbFileName=DB_mydatabase;
                       Initial Catalog=mssql.mywebsite.com;
                       User ID=myUserName;
                       Password=myPassword;"
     providerName="System.Data.SqlClient" />