GroupBy with linq method syntax (not query syntax)
How would the following query look if I was using the extension method syntax?

    var query = from c in checks
    group c by string.Format("{0} - {1}", c.CustomerId, c.CustomerName) 
    into customerGroups
    select new { Customer = customerGroups.Key, Payments = customerGroups }
GroupBy with linq method syntax (not query syntax)
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How would the following query look if I was using the extension method syntax?

    var query = from c in checks
    group c by string.Format("{0} - {1}", c.CustomerId, c.CustomerName) 
    into customerGroups
    select new { Customer = customerGroups.Key, Payments = customerGroups }