void AddTable(DataTable dataTable)
 {
     var field = new QueryField(dataTable);
     _builder.QueryFields.Add(field);
     OnPropertyChanged("QueryList");
     OnPropertyChanged("SqlQuerry");
 }
 void AddColumn(DataColumn dc)
 {
     var field = new QueryField(dc);
     _builder.QueryFields.Add(field);
     OnPropertyChanged("QueryList");
     OnPropertyChanged("SqlQuerry");
 }