OleDbDataReader　提示错误

///formLoad(object sender, EventArgs e)
    OleDbConnection fswCon = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + conPath + ";");
    if (fswCon.State == ConnectionState.Closed) fswCon.Open();

///private void watcher_Folder(object sender, FileSystemEventArgs e)
    string reSql = @"select * from [Folder] where change='" + e.ChangeType.ToString() + "' and fullName='" + e.FullPath.ToString() + "'";
    OleDbCommand reCmd = new OleDbCommand(reSql, fswCon);
    OleDbDataReader reRead = reCmd.ExecuteReader();
    if (!reRead.Read())
    {
          string deSql = @"delete from [Folder] where change='" + e.ChangeType.ToString() + "' and fullName='" + e.FullPath.ToString() + "'";
          OleDbCommand deCmd = new OleDbCommand(deSql, fswCon);
          try { deCmd.ExecuteNonQuery(); }
          catch (System.Exception E) { MessageBox.Show(E.ToString()); }
          finally { deCmd.Dispose(); }
     }
     reCmd.Dispose();
     string crSql = @"insert into [Folder](change,dataName,changeTime,fileName,fileType,viewPath,fullPath) values ('" +
                    e.ChangeType.ToString() + "','" + dataName.ToString() + "','" + file.LastWriteTime.ToString() + "','" + Path.GetFileNameWithoutExtension(e.FullPath) + "','" +
                    Path.GetExtension(e.FullPath) + "','" + Path.GetDirectoryName(viewPath).ToString() + "','" + e.FullPath.ToString() + "')";
     OleDbCommand crCmd = new OleDbCommand(crSql, fswCon);
     try { crCmd.ExecuteNonQuery(); }
     catch (System.Exception E) { MessageBox.Show(E.ToString()); }
     finally { crCmd.Dispose(); }

SQL语法
[解决办法]
字段名有问题，或者没有设置主键