DataView dv = dt.DefaultView;

  dv.Delete();

  dv.Delete();

  //找出所有刚删除掉的行 1、5

  dv.RowStateFilter = DataViewRowState.Deleted;

dv.RowFilter = " 列名 = '值'";

//模糊匹配

dv.RowFilter = " 列名 LIKE '值%'";

dv.Sort = "列1 DESC, 列2";

dv.Sort = "列名";

 // //单行时，返回行索引  多行时，返回首行索引值

int i =  dv.Find("值");

//多列排序

dv.Sort = "列1,列2";

//单行时，返回行索引  多行时，返回首行索引值

int i = dv.Find(new object[] { "值1", "值2" });

dv.Sort = "列名";

DataRowView[] drV = dv.FindRows("值");

dv.Sort = "列1,列2";
DataRowView[] drV = dv.FindRows(new object[] { "值1", "值2"});