if add row to DataTable
DataRow row = datatable1.NewRow();
row[\"column2\"]=\"column2\";
row[\"column6\"]=\"column6\";
datatable1.Rows.Add(row);
If anyone wanted to Add DataTable as a source of gridview then--
DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("column1"));
dt.Columns.Add(new DataColumn("column2"));
DataRow dr = dt.NewRow();
dr[0] = "column1 Value";
dr[1] = "column2 Value";
dt.Rows.Add(dr);
dataGridView1.DataSource = dt;