Dynamically adding columns to the GridView control

BoundField ID=NULL;
ID=new BoundField();
ID.HeaderText="ID";
ID.DataField="ID";
GridView1.Columns.Add(ID);

BoundField City=NULL;
City=new BoundField();
City.HeaderText="City";
City.DataField="City";
GridView1.Columns.Add(City);

DataTable dt=new DataTable();
dt.Columns.Add(new DataColumn("ID",typeof(string)));
dt.Columns.Add(new DataColumn("City",typeof(string)));

DataRow dr=dt.NewRow();
dr["ID"]="";
dr["City"]="";

dt.Rows.Add(dr);

GridView1.DataSource=dt;

GridView1.DataBind();