I need help with embedded sql and c#. How does C# implement embedded sql?

 From your question, I assume that you asking how to query a database using c#?

 String connString = ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ToString();
String sSQL = "select * from  dbo.Categories "; 

using (SqlConnection conn = new SqlConnection(connString))
{
        using (SqlCommand cmd = new SqlCommand())
        {
                conn.Open();
                cmd.CommandText = sSQL;
                cmd.Connection = conn;


                using (SqlDataReader dr = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection))
                {
                        using (DataSet result = new DataSet())
                        {
                                result.Load(dr);
                        }
                }
        }
}