vb.net - RegisterAsyncTask doesn't run asynchronous task in ASP.Net Web Forms page -


i have login page in asp.net web forms application. on successful login time-consuming database operations slowing login process, want run these asynchronously.

i trying in recommended way using registerasynctask, etc. have set @page async="true" in aspx file , implemented following code in aspx.vb file (cut down show essential elements):

       protected sub btnlogin_click(byval sender system.object, byval e system.eventargs) handles btnlogin.click              if loginsuccessful()                dologinstuff()             end if          end sub          private sub dologinstuff()             ...             registerasynctask(new pageasynctask(function() doexpensivedbcheck(userkey)))             page.executeregisteredasynctasks()             ...         end sub          private async function doexpensivedbcheck(byval userkey integer) task            ...            response = await task.run(function() dbservice.docheck(userkey))            if response.success andalso response.items.count() = 1                session("dbvalueforuselater") = response.item[0].whatever            end if         end function

however doexpensivedbcheck function never runs (a breakpoint @ start of function never hit), , session("dbvalueforuselater") never set.

i thought maybe doesn't run because login function finishes doing redirect home page of application, added page.executeregisteredasynctasks() in case, makes no difference.

interestingly if create task doexpensivedbcheck rather using registerasynctask, , wait on task application freezes, , again breakpoint in doexpensivedbcheck never hit.

does know doing wrong here?


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