vb.net - VB: User Control Object Reference Error with Datagridview -

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i'm working in visual studio 2010 visual basic. have windows form , user control. on user control datagridview, linked table, public shared.

when putting user control on windows form following message, displayed form was:

to prevent possible data loss before loading designer, the following errors must resolved: object reference not set an instance of object.

at fehlteilmanagement.checkmultiple.checkmultiple_load(object sender, eventargs e) in c:\users\to113808\desktop\fehlteilmanagement\visual studio\fehlteilmanagement\fehlteilmanagement\forms\checkmultiple.vb:line 7 @ system.windows.forms.usercontrol.onload(eventargs e) @ system.windows.forms.usercontrol.oncreatecontrol() @ system.windows.forms.control.createcontrol(boolean fignorevisible) @ system.windows.forms.control.createcontrol() @ system.windows.forms.control.controlcollection.add(control value) @ system.windows.forms.form.controlcollection.add(control value) @ system.windows.forms.design.controldesigner.designercontrolcollection.add(control c)

i know has usercontrol_load function, looks this:

        dgv_multipleft.datasource = tablemultiplelinesft     dgv_multipleft.columns("neu").visible = false      = 0 tablemultiplelinesft.rows.count - 1         if not isdbnull(tablemultiplelinesft.rows(i).field(of boolean?)("neu")) , tablemultiplelinesft.rows(i).field(of boolean?)("neu") = true             dgv_multipleft.rowsdefaultcellstyle.backcolor = color.greenyellow         end if

if delete changes in datagridview (dgv_multipleft) fine. though error-message, program compiles fine , works. want ask can it.

if want have designer.vb post it, if has idea, thankful.

best regards


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