1 DataTable datatable1 = new DataTable();
 2  DataTable datatable2 = new DataTable();
 3             datatable1.Columns.Add("id",Type.GetType("System.Int32"));
 4             datatable1.Columns.Add("name",Type.GetType("System.String"));
 5             DataRow dr = datatable1.NewRow();
 6             dr["id"] = "1";
 7             dr["name"] = "aa";
 8             datatable1.Rows.Add(dr);
 9             dr = datatable1.NewRow();
10             dr["id"] = "2";
11             dr["name"] = "bb";
12             datatable1.Rows.Add(dr);
13             dr = datatable1.NewRow();
14             dr["id"] = "3";
15             dr["name"] = "cc";
16             datatable1.Rows.Add(dr);
17 
18             datatable2.Columns.Add("name",Type.GetType("System.String"));
19             DataRow dr1 = null;
20             for (int i = 0; i < datatable1.Rows.Count; i++)
21             {
22                 dr1 = datatable2.NewRow();
23                 dr1["name"] = datatable1.Rows[i]["name"].ToString();
24                 datatable2.Rows.Add(dr1);
25             }