Count distinct values of a column in dataGridView using linq in .NET

Question

I need to count and present distinct/unique values in a dataGridView. I want to present it like this, and this code works just fine with lists.

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Answer 1

I think this will do it, but I'm not 100% sure. Try it out, if you have any issues let me know...

var distinctRows = (from GridViewRow row in dataGridView1.Rows 
                    select row.Cells[0]
                   ).Distinct().Count();

Answer 2

This will work for your example:

var result = dataGridView1.Rows.Cast<DataGridViewRow>()
    .Where(r => r.Cells[0].Value != null)
    .Select (r => r.Cells[0].Value)
    .GroupBy(id => id)
        .OrderByDescending(id => id.Count()) 
        .Select(g => new { Id = g.Key, Count = g.Count() });