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for (int i = 0; i <DataGridView.Rows.Count; i++)
            {
                try
                {
                    var values = DataGridView.Rows.Cast<DataGridViewRow>().Select(x => x.Cells[i].Value);
                    var sector1 = values.Count(x => Convert.ToInt32(x) >= 34 && Convert.ToInt32(x) <= 50);
var sector2 = values.Count(x => Convert.ToInt32(x) >= 51 && Convert.ToInt32(x) <= 100);
                    
                    DataGridView.Rows[i].Cells[4].Value = values.ToString();
                }
                catch (Exception ex)
                {
                   MessageBox.Show(ex.Message);
                }

console.log(0 / 0); // returns NaN
console.log(1 / 0); // returns Infinity

// let's get fancy
var divide = (...args) => args.reduce((a, b) => a / b);

console.log(divide(0, 0)); // still returns NaN
console.log(divide(1, 0)); // still returns Infinity

// if I want to save the sucker in a database
var result = divide(42, 0);
saveMeSomehow.result = isNaN(result) || !isFinite(result) ? 0 : result;