//On a mojo Web Page, this will get you your connection string like this
    private static string GetConnectionString()
    {
         return ConfigurationManager.AppSettings["MSSQLConnectionString"];
    }

      //I'm a stored procedure type guy
      //and in mojoPortal I use the mojoPortal.Data.SqlParameterHelper in this example
       public static int k_proc_keys_GetNextKeyByField(string fieldName)
        {
            SqlParameterHelper sph = new SqlParameterHelper(GetConnectionString(), "k_proc_keys_GetNextKeyByField", 2);
            sph.DefineSqlParameter("@FieldName", SqlDbType.NVarChar, 50, ParameterDirection.Input, fieldName);
            sph.DefineSqlParameter("@NextKey", SqlDbType.Int, ParameterDirection.Output, null);

            sph.ExecuteNonQuery();
            int newID = Convert.ToInt32(sph.Parameters[1].Value);
            return newID;
        }

        //Outside of mojoPortal in console apps I use code like this to return a DataTable
        public static DataTable ReadUrlList()
        {
            SqlConnection kickerConnection = new SqlConnection();
            kickerConnection.ConnectionString = @"Server=.\SQLEXPRESS;Database=mojoPortal_database;UID=mojouser;PWD=mojopassword;";

            DataTable UrlsDataTable = new DataTable();

            string query = "SELECT StuffGuid, StuffName from myStuff Where IsValid = 1 OR ((EndUtc Is Null) OR (EndUtc > @EndUtc))";

            SqlCommand cmd = new SqlCommand(query, kickerConnection);

            cmd.Parameters.Add("@EndUtc", SqlDbType.DateTime);
            cmd.Parameters["@EndUtc"].Value = DateTime.Now;

            SqlDataAdapter urlAdapter = new SqlDataAdapter(cmd);

            kickerConnection.Open();

            urlAdapter.Fill(myDataTable);

            kickerConnection.Close();
            urlAdapter.Dispose();

            return myDataTable;
        }

Actually the first bit of code at the top for your connection string along with a gazillion C# database examples from a Google search will get you data.

Rick