DataTableはよく使う操作です。

列と行を追加する3つの方法（転載）原文の住所：http://www.cnblogs.com/jRoger/articles/1887581.html
 

DataTable tblDatas =new DataTable("Datas");

DataColumn dc =null;

dc = tblDatas.Columns.Add("ID", Type.GetType("System.Int32"));

dc.AutoIncrement =true;//    

dc.AutoIncrementSeed =1;//   1

dc.AutoIncrementStep =1;//   1

dc.AllowDBNull =false;

dc = tblDatas.Columns.Add("Product", Type.GetType("System.String"));

dc = tblDatas.Columns.Add("Version", Type.GetType("System.String"));

dc = tblDatas.Columns.Add("Description", Type.GetType("System.String"));

DataRow newRow;

newRow = tblDatas.NewRow();

newRow["Product"] ="          ";

newRow["Version"] ="2.0";

newRow["Description"] ="          ";

tblDatas.Rows.Add(newRow);

newRow = tblDatas.NewRow();

newRow["Product"] ="          ";

newRow["Version"] ="3.0";

newRow["Description"] ="          ";

tblDatas.Rows.Add(newRow); 

 
dt 2.Rows.Add（rowNew.ItemAray）；DataTable Rowを追加する方法