class clsoledb  {    OleDbConnection connection;    public void OpenConnection(string xlsFils)    {      if (!File.Exists(xlsFils))      {        MessageBox.Show("文件" + xlsFils + "不存在", "提示");        return;      }      string conn = "Provider = Microsoft.Jet.OLEDB.4.0;Data Source =" + xlsFils + ";Extended Properties='Excel 8.0;HDR=NO;IMEX=1;'";      connection = new OleDbConnection(conn);      try      {        connection.Open();      }      catch (OleDbException ex)      {        if (ex.ErrorCode == -2147467259)        {          connection.ConnectionString = "Provider = Microsoft.Ace.OLEDB.12.0;Data Source =" + xlsFils + ";Extended Properties='Excel 12.0;HDR=NO;IMEX=1;'";          connection.Open();        }      }    }    public DataTable Select()    {      DataTable dt = new DataTable();      string Sql = "select * from [$A1:R65536]";      OleDbDataAdapter mycommand = new OleDbDataAdapter(Sql, connection);      mycommand.Fill(dt);      if (dt.Rows.Count > 0)      {        DataRow dr = dt.Rows[0];        for (int col = 0; col < dt.Columns.Count; col++)        {          dt.Columns[col].ColumnName = dr[col].ToString();        }        dt.Rows[0].Delete();        dt.AcceptChanges();      }      return dt;    }  }