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.

        List<         


        

Answer 1

This will work for your example:

var result = dataGridView1.Rows.Cast()
    .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() });