c# - not able to find property in DataSource -


i trying tu bind accessdatasource gridview in asp.net. accessdatasource composed of 2 tables, let's say,

table data, table modifications

my query select data accessdatasource following

select data.*, iif(isnull(modifications.comments), ' ', modifications.comments) comments,                iif(isnull(modifications.disengagement), 0, modifications.disengagement) disengagement                (data left outer join modifications on data.[project number] = modifications.[project number])

i use query builder visual studio verify output previous query , ok.

every field in table "data" fine , don't cause exceptions thrown. exemple, work fine because "amount" column "data" table.

<asp:boundfield datafield="amount"         headertext="<%$resources:i18n, column_amount %>"          sortexpression="amount" itemstyle-horizontalalign="center" itemstyle-width="1%" />

from point fine , move on, created boundfield in gridview containing data "modifications.[disengagement]", : 

<asp:boundfield datafield="disengagement"     headertext="<%$resources:i18n, column_disengagement %>"      sortexpression="disengagement" itemstyle-horizontalalign="center" itemstyle-width="1%" />

but can't seem access column in "modifications" table , when launch webpage, error : 

system.web.httpexception: unable find property 'disengagement' in selected data source.

i have double checked names of columns , names of variables in code, continue so, triple check if must, think problem comes somewhere else.

do guys have ideas ?

i have found problem. launching query in code button click , query not getting data. have fixed problem , implement "singleton" solution manage query strings in code.


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