DataTable myDataTable=new DataTable();
myDataTable.PrimaryKey = new DataColumn[]
{
myDataTable.Columns["砂轮名称"]
};
DataRow myremoveDatarow=myDataTable.Rows.Find(1);//表没有主键
listView1.Items.Remove(listView1.SelectedItems[0]);
myremoveDatarow.Delete ();
tempconn.Open();