方法一:

DataTable tblDatas = new DataTable("Datas");

DataColumn dc = null;

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

dc.AutoIncrement = true;//自动增加

dc.AutoIncrementSeed = 1;//起始为1

dc.AutoIncrementStep = 1;//步长为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"] = "水果刀";

newRow["Version"] = "2.0";

newRow["Description"] = "打架专用";

tblDatas.Rows.Add(newRow);

newRow = tblDatas.NewRow();

newRow["Product"] = "折叠凳";

newRow["Version"] = "3.0";

newRow["Description"] = "行走江湖七武器之一";

tblDatas.Rows.Add(newRow);

方法二：

            //创建datatable 的一个示例

            DataTable tblDatas = new DataTable("Datas");

            tblDatas.Columns.Add("ID", Type.GetType("System.Int32")); //创建一列，自动增长

            tblDatas.Columns[0].AutoIncrement = true;

            tblDatas.Columns[0].AutoIncrementSeed = 1;

            tblDatas.Columns[0].AutoIncrementStep = 1;

            tblDatas.Columns.Add("Product", Type.GetType("System.String")); //创建一列

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

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

            tblDatas.Rows.Add(new object[] { null, "a", "b", "c" }); //创建一行

            tblDatas.Rows.Add(new object[] { null, "a", "b", "c" });

            tblDatas.Rows.Add(new object[] { null, "a", "b", "c" });

            tblDatas.Rows.Add(new object[] { null, "a", "b", "c" });

            tblDatas.Rows.Add(new object[] { null, "a", "b", "c" });

 

//2,在DataTable中添加两列 时间

            DataColumn dc1 = new DataColumn("Year");

            DataColumn dc2 = new DataColumn("Month");

            dt.Columns.Add(dc1);

            dt.Columns.Add(dc2);

            //给新添加的两列添加数据

            for (int i = 0; i < dt.Rows.Count; i++)

            {

                DataRow dr = dt.Rows[i];

                dr.BeginEdit();

                dr["Year"] = "2009"

                dr["Month"] = "10";

                dr.EndEdit();

                dt.AcceptChanges();

            }