C# - Move TextBox to ListBox and be able to use Add/Remove Buttons -

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i have 3 textboxes have values in them. values split depending on strings contain using different regex.

these textboxes in background , user not see them.. however, do want user see listboxes correspond each textbox. that code below is:

    private void listformathelper()     {         // splits lines in rich text boxes         var listonelines = placementonerichtextbox.text.split('\n');         var listtwolines = placementtworichtextbox.text.split('\n');         var listuserlines = userdefinedrichtextbox.text.split('\n');          // resest text in listboxes         placementonelistbox.resettext();         placementtwolistbox.resettext();         userdefinedlistbox.resettext();          // set selection mode multiple , extended.         placementonelistbox.selectionmode = selectionmode.multiextended;         placementtwolistbox.selectionmode = selectionmode.multiextended;         userdefinedlistbox.selectionmode = selectionmode.multiextended;          // shutdown painting of listbox items added.         placementonelistbox.beginupdate();         placementtwolistbox.beginupdate();         userdefinedlistbox.beginupdate();          // display items in listbox.         placementonelistbox.datasource = listonelines;         placementtwolistbox.datasource = listtwolines;         userdefinedlistbox.datasource = listuserlines;          // allow listbox repaint , display new items.         placementonelistbox.endupdate();         placementtwolistbox.endupdate();         userdefinedlistbox.endupdate();     }

however, problem cannot move each item in list... mean want able have move up, move down,move left, , move right buttons. move up , move down buttons allow user move selected item(s) or down (to change order of items) in specified list. move left , move right buttons allow user move item on current list list "right" or "left" of current list.

visual layout of listboxes:

placementonelistbox                userdefinedlistbox                placementtwolistbox |                 |                |                 |               |                 | |                 |                |                 |               |                 | |                 |                |                 |               |                 | |                 |                |                 |               |                 | |_________________|                |_________________|               |_________________|

and error:

"items collection cannot modified when datasource property set."

move button code:

    private void moveupbutton_click(object sender, eventargs e)     {         if (placementonelistbox.selectedindex != 0 && placementonelistbox.selectedindex != -1)         {             object item = placementonelistbox.selecteditem;             int index = placementonelistbox.selectedindex;             placementonelistbox.items.removeat(index);             placementonelistbox.items.insert(index - 1, item);         }     }

move right button code:

    private void moverightbutton_click(object sender, eventargs e)     {         (int = 0; < placementtwolistbox.items.count; i++)         {             userdefinedlistbox.items.add(placementtwolistbox.items[i].tostring());             placementtwolistbox.items.remove(placementtwolistbox.selecteditem);         }     }

questions:

  • is there way go can modify datasource property?
  • does want take crack @ this?
  • how can change listformathelper() function need , allow buttons work without error above?

you have 2 options:

  1. don't use data binding; convert data source sequence of objects , populate list(s) adding objects in sequence items property. manage order using items property, trying do.
  2. modify data source alter order. how depends on data source using.

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