DateTime d1 = Convert.ToDateTime("1/10/2018").Date;
DateTime d2 = Convert.ToDateTime("1/22/2018").Date;
var rows = dataGridView1.Rows.Cast<DataGridViewRow>()
.Where(x =>
d1.Date >= Convert.ToDateTime(x.Cells[0].Value).Date &
d2.Date <= Convert.ToDateTime(x.Cells[1].Value).Date).ToArray();
dataGridView1.Rows.Clear();
dataGridView1.Rows.AddRange(rows);
DateTime d = Convert.ToDateTime("1/10/2018").Date;
var rows = dataGridView1.Rows.Cast<DataGridViewRow>()
.Where(x =>
d.Date >= Convert.ToDateTime(x.Cells[0].Value).Date &
d.Date <= Convert.ToDateTime(x.Cells[1].Value).Date
).ToArray();
dataGridView1.Rows.Clear();
dataGridView1.Rows.AddRange(rows);
(dataGridView1.DataSource as DataTable).DefaultView.RowFilter = string.Format("Column1 >= #{0}# AND Column2 <= #{1}#", Convert.ToDateTime(textBox1.Text).Date, Convert.ToDateTime(textBox2.Text).Date); DataView dv = new DataView(dt);
dv.RowFilter = "DateStart = #" + Convert.ToDateTime(textBox1.Text).Date + "# AND DateEnd = #" + Convert.ToDateTime(textBox1.Text).Date + "#";
dv.RowStateFilter = DataViewRowState.ModifiedCurrent;
dv.Sort = "Datum DESC";
dataGridView1.DataSource = dv;
dataGridView1.Refresh();