asp.net - Connection property has not been initialized when filling a DataSet -

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so here issue:

currently trying make report show 1st , 2nd shifts, multiple days...

so if select range 6/02 - 6/04, running query 3 times... once 6/02, 6/03, , 6/04... can select shift, dates, 4:30am-4:30pm 1st shift....

currently have error, when trying put queries/calls inside loop... calculate difference of 2 dates , set them fine, connection string gives me error:

enter image description here

if image not easy see here text description of error:

server error in '/mfgx_test' application.

fill: selectcommand.connection property has not been initialized.

description: unhandled exception occurred during execution of current web request. please review stack trace more information error , originated in code.

exception details: system.invalidoperationexception: fill: selectcommand.connection property has not been initialized.

source error:

line 623: dim dstop1 new dataset line 624: dim datop1 new sqldataadapter(strsql, mycn1) line 625:
datop1.fill(dstop1) line 626: line 627: mycn1.close()

source file: c:\inetpub\wwwroot\mfgx_test\defectsbyround.aspx.vb
line: 625

which leads me beleive wrong connection string being outside of loop... code follows (although bit cleaned easier read):

    dim mycn1 new sqlconnection     mycn1.connectionstring = "server=blah;database=blah;user id=blah;password=blah"     mycn1.open()      = 0 session("daysdiff")         strsql = "blah.blah"         dim dstop1 new dataset         dim datop1 new sqldataadapter(strsql, mycn1)         datop1.fill(dstop1)          mycn1.close()         mycn1 = nothing          if dstop1.tables(0).rows.count > 0            spitout2(dstop1)         end if             txtstartdate.text = dateadd("d",1,txtstartdate.text)            txtenddate.text = dateadd("d",1,txtenddate.text)    next

that's because closing connection inside loop , next iteration there no open connection present , hence exception (see pointed below) 

   mycn1.close()     mycn1 = nothing

you should declare dataset , tableadapter out side loop context. code should below

dim mycn1 new sqlconnection mycn1.connectionstring = "server=blah;database=blah;user id=blah;  password=blah" mycn1.open() dim dstop1 new dataset dim datop1  = 0 session("daysdiff")     strsql = "blah.blah"     datop1 new sqldataadapter(strsql, mycn1)     datop1.fill(dstop1)   ....... next       mycn1.close()     mycn1 = nothing

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