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DataTable DT1 = new DataTable();
DT1.Columns.Add("编号",typeof(int));
DT1.Columns.Add("内容",typeof(string));
DataRow rw1 = DT1.NewRow();
rw1[0] = 1;
rw1[1] = "北京";
DT1.Rows.Add(rw1);
DataRow rw2 = DT1.NewRow();
rw2[0] = 1;
rw2[1] = "上海";
DT1.Rows.Add(rw2);
DataRow rw3 = DT1.NewRow();
rw3[0] = 1;
rw3[1] = "天津";
DT1.Rows.Add(rw3);
DataRow rw4 = DT1.NewRow();
rw4[0] = 2;
rw4[1] = "武汉";
DT4.Rows.Add(rw4);
DataRow rw5 = DT1.NewRow();
rw5[0] = 2;
rw5[1] = "广州";
DT1.Rows.Add(rw5);
DataRow rw6 = DT1.NewRow();
rw6[0] = 2;
rw6[1] = "深圳";
DT1.Rows.Add(rw6);
DataRow rw7 = DT1.NewRow();
rw7[0] = 3;
rw7[1] = "重庆";
DT1.Rows.Add(rw7);
DataRow rw8 = DT1.NewRow();
rw8[0] = 3;
rw8[1] = "青岛";
DT1.Rows.Add(rw8);
DataRow rw9 = DT1.NewRow();
rw9[0] = 3;
rw9[1] = "沈阳";
DT1.Rows.Add(rw9);
for(int i=0;i<DT1.Rows.Count;i++)
{
if((int)DT1.Rows[i][0] != 2)
{
DT1.Rows[i].RemoveAt(i);
}
}
DataTable DT2 = new DataTable();
DT2 = DT1.Copy();