winforms - Windows Form not changing underlying Entity Data -

can see simple mistake can't?

i opening form allow assigning job numbers invoices not have any.

this code in applications main form handles this:

dim unknownjobs = pur in context.purchases                   pur.senttomyob = false andalso                         pur.job.jobnumber = string.empty                   select pur  if unknownjobs.any     frmjobs2.jobsbindingsource.datasource = (from j in context.jobs1                                             order j.jobnumber                                             select j).tolist     frmjobs2.purchasesbindingsource.datasource = unknownjobs     progress.hide()     if frmjobs2.showdialog = windows.forms.dialogresult.ok         context.savechanges()     end if end if 

this form gets opened relevant column details displayed

the code behind simple , consists of:

public class formjobs2     ''' <summary>     ''' ok clicked     ''' </summary>     ''' <param name="sender"></param>     ''' <param name="e"></param>     ''' <remarks></remarks>     private sub okbutton_click(sender system.object, e system.eventargs) handles okbutton.click         me.dialogresult = windows.forms.dialogresult.ok         me.close()     end sub      ''' <summary>     ''' cancel clicked     ''' </summary>     ''' <param name="sender"></param>     ''' <param name="e"></param>     ''' <remarks></remarks>     private sub skipbutton_click(sender system.object, e system.eventargs) handles skipbutton.click         me.dialogresult = windows.forms.dialogresult.cancel         me.close()     end sub end class 

what happens when runs can select job numbers not display on datagridview , not update underlying context.

where stupid mistake, please?

it appears if trying assign frmjobs2.purchasesbindingsource.datasource iqueryable.

the line should read:

frmjobs2.purchasesbindingsource.datasource = unknownjobs.tolist