Somewhat similar to this question:

[Where do I put the "orderby group.key" in this LINQ statement?](https://stackoverflow.com/questions/1679447/where-do-i-put-the-orderby-group-key-in-this-linq-statement)

Except I'm using [Dynamic.Linq](https://github.com/kahanu/System.Linq.Dynamic) which makes this a bit harder. I have a bunch of data coming from a database and then I'm grouping by some field and then outputing the result. The problem is that the ordering of the groups seems to randomly jump around which isn't very convenient for the end-user. So taking inspiration from the linked question, if I had this:

```
string[] words = { "boy","car", "apple", "bill", "crow", "brown" };
// note the first non-dynamic select here was just because I don't think dynamic linq 
// will support indexing a string like that and it's not an important detail anyway
var wordList = words.Select(w => new {FirstLetter = w[0], Word = w})
                    .GroupBy("new (FirstLetter)","Word");  

foreach(IGrouping<object, dynamic> g in wordList)
{
    Console.WriteLine("Words that being with {0}:",
        g.Key.ToString().ToUpper());
    foreach (var word in g)
        Console.WriteLine("  " + word);
}

Console.ReadLine();

```

How would I get it to order the keys? At least part of the problem is that the dynamic `GroupBy` returns an `IEnumerable`. I thought it might be as easy as:

```
var wordList = words.Select(w => new {FirstLetter = w[0], Word = w})
                    .GroupBy("new (FirstLetter)","Word")
                    .OrderBy("Key"); 

```

But that gives me a `System.ArgumentException` (`At least one object must implement IComparable.`) when it hits the `foreach` loop.

My actual code in my project is a little more complicated and looks something like this:

```
var colGroup = row.GroupBy(string.Format("new({0})", 
                           string.Join(",", c)), string.Format("new({0})", 
                           string.Join(",", v)));

```

Where `c` is a list of strings that I need to group by and v is a list of strings that I need to select in each group.