if add row to DataTable
DataRow row = datatable1.NewRow();
row[\"column2\"]=\"column2\";
row[\"column6\"]=\"column6\";
datatable1.Rows.Add(row);
here is another way to do such
private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
dataGridView1.ColumnCount = 3;
dataGridView1.Columns[0].Name = "Name";
dataGridView1.Columns[1].Name = "Age";
dataGridView1.Columns[2].Name = "City";
dataGridView1.Rows.Add("kathir", "25", "salem");
dataGridView1.Rows.Add("vino", "24", "attur");
dataGridView1.Rows.Add("maruthi", "26", "dharmapuri");
dataGridView1.Rows.Add("arun", "27", "chennai");
}