DT = new DataTable();

            DataRow DR = DT.NewRow();
            //构建列（名称，数据类型）

            DT.Columns.Add("代码", Type.GetType("System.String"));

            DT.Columns.Add("进价", Type.GetType("System.String"));

            DT.Columns.Add("售价", Type.GetType("System.String"));

            DT.Columns.Add("原因", Type.GetType("System.String"));

            DT.Columns.Add("原进价", Type.GetType("System.String"));

            DT.Columns.Add("原售价", Type.GetType("System.String"));
           //构建第一条数据

            DR["代码"] = TxtCode.Text.Trim();

            DR["进价"] = TxtJinPrice.Text.Trim();

            DR["售价"] = TxtShouPrice.Text.Trim();

            DR["原因"] = TxtYuanYin.Text.Trim();

            DR["原进价"] = OldPring;

            DR["原售价"] = OldPrice;

            DT.Rows.Add(DR);

            a = ;

DataTable  tblDatas = newDataTable("Datas");

DataColumn dc = null;

//赋值给dc，是便于对每一个datacolumn的操作

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

dc.AutoIncrement= true;//自动增加

dc.AutoIncrementSeed = ;//起始值1

dc.AutoIncrementStep = ;//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"));

  //添加两条数据
  //* datatable 行数据可以叠加

DataRow newRow;

newRow = tblDatas.NewRow();

newRow["Product"] = "大话西游";

newRow["Version"] = "2.0";

newRow["Description"] = "我很喜欢";

tblDatas.Rows.Add(newRow);

newRow = tblDatas.NewRow();

newRow["Product"] = "梦幻西游";

newRow["Version"] = "3.0";

newRow["Description"] = "比大话更幼稚";

tblDatas.Rows.Add(newRow);

DataTable tblDatas = newDataTable("Datas");

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

tblDatas.Columns[].AutoIncrement = true;

tblDatas.Columns[].AutoIncrementSeed = ;

tblDatas.Columns[].AutoIncrementStep = ;

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

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

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

  //直接添加三条数据

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

tblDatas.Rows.Add(newobject[] { 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" });

  DataTable DT = new DataTable();

            DataRow DR = DT.NewRow();

            for(int a =  ;a<dataGridViewX1.Columns.Count;a++)

            {

            DT.Columns.Add(dataGridViewX1.Columns[a].HeaderCell.Value.ToString(),Type.GetType("System.String"));

            }

            int RowCount = dataGridViewX1.Rows.Count;

            int CellCount = dataGridViewX1.Columns.Count;

            for (int a = ; a < RowCount-; a++)

            {//新实例化数据

                DR = DT.NewRow();

                for (int b = ; b < CellCount; b++)

                {

                  // dataRow 构建行数据 构建一条添加一条

                   DR[b] = dataGridViewX1.Rows[a].Cells[b].Value.ToString();

                }

                DT.Rows.Add(DR);

            }