c# - Can't change properties of LinkButtons in CodeBehind -


i have rlly trouble imo simple thing allready did million times, time, cant.

i have linkbuttons in gridview 

<asp:templatefield>     <itemtemplate>         <asp:linkbutton id="gvcon_tfedit" runat="server" cssclass="eh_label_style" commandargument="edit" commandname="edit" text="edit"></asp:linkbutton>     </itemtemplate> </asp:templatefield>

and have 6 times. allways 1 edit , 1 delete-linkbutton.

then try change visible of them in codebehind @ line 5 (if comment out, on 6 etc):

1    protected void page_prerendercomplete(object sender, eventargs e) 2            { 3                if (session["permissions"].tostring() == "user") 4                { 5                    gvcomp_tfdelete.visible = false; 6                    gvcomp_tfedit.visible = false; 7                    gvcon_tfdelete.visible = false; 8                    gvcon_tfedit.visible = false; 9                    gvmatr_tfdelete.visible = false; 10                   gvmatr_tfedit.visible = false;

but allways brings me goodknown exception:

operation not valid due current state of object

well - i'm sure object isnt null there anymore ?! (and session["permissions"] isnt null sure also, because getting status in preload allready ...)

and maybe have tell more, because had problems linkbuttons bevore ^^ - in templatefields had same linkbuttons, changed name of lb, , since couldnt use them in codebehind. because werent in designerfile anymore ... tried alot of tips found evrywhere in inet, tips here - didnt worked (like rebuilding designerfile, writing linkbuttons new aspx-file made sure file in right folder etc ...) nothing worked. added them hand designer.cs. can "use" them in codebehind, when start debugging - runs error.

would nice if me, annoying ...

since using gridview, have use event rowdatabound gridview.

and in event, have check e.row.rowtype == datacontrolrowtype.datarow.

after that, can use 

linkbutton lb = ((linkbutton)e.row.findcontrol("gvcon_tfedit"));

to linkbutton current row, , use lb.visible = false; or whatever code need.


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