if add row to DataTable
DataRow row = datatable1.NewRow();
row[\"column2\"]=\"column2\";
row[\"column6\"]=\"column6\";
datatable1.Rows.Add(row);
Like this:
dataGridView1.Columns[0].Name = "column2";
dataGridView1.Columns[1].Name = "column6";
string[] row1 = new string[] { "column2 value", "column6 value" };
dataGridView1.Rows.Add(row1);
Or you need to set there values individually use the propery .Rows(), like this:
dataGridView1.Rows[1].Cells[0].Value = "cell value";