Ok, if I change code to manually insert items initially by looping through array, I can then remove/insert items later on, so think will stick to that one for now. Stay well Jacob Kruger jacob.kruger@xxxxxxxxxxxx -----Original Message----- From: program-l-bounce@xxxxxxxxxxxxx [mailto:program-l-bounce@xxxxxxxxxxxxx] On Behalf Of Jacob Kruger Sent: Tuesday, October 27, 2009 10:45 AM To: program-l@xxxxxxxxxxxxx Subject: [program-l] Question relating to manually updating value/item in combobox - windows application using C# As part of building my interface based on the contents of an XML file, I am generating combo boxes and populating them by setting their datasource properties equal to a string[] array that I am generating by splitting the incoming text/string values. That piece of code looks like this: char[] separators = {','}; string[] stItems = stText.Split(separators); cbNew.DataSource = stItems; Only problem now is I want to allow the user to select an item, and then try edit it, but when I try something like updating the item, nothing happens, and if I try to remove the selected item and then insert a new one using the items collection, I get a JIT debugger error relating to being unable to update the collection items of a databound object, when the datasource is set or something like that. Suppose if I manually added each item to the items collection initially by looping through array, it might then be more prepared to let me update them, or else I should do something like store the data arrays in global variables and update those or something to hope the databinding would carry out the update for me? The code there currently looks like this: int iIndex = frmParent.curCB.SelectedIndex; frmParent.curCB.Items.RemoveAt(iIndex); frmParent.curCB.Items.Insert(iIndex - 1, "new value"); The error text specifically states the following: System.ArgumentException: Items collection cannot be modified when the DataSource property is set Another question is when I want to get the second sub form shown to allow the user to edit the values in these combo boxes, or add new ones, I seem to have to manually create an instance of the other form class, and then tell it to perform a method/subroutine to tell it who it's parent form is so they can 'communicate' with each other, and am pretty sure in VB.Net would generally just have called a .Show class to an automatic instance of the other forms class or something, but suppose might also be wrong about that one...<smile> Sorry if this is a silly question, but, to be honest haven't recently really done much work on windows apps like this. Stay well Jacob Kruger jacob.kruger@xxxxxxxxxxxx ** To leave the list, click on the immediately-following link:- ** [mailto:program-l-request@xxxxxxxxxxxxx?subject=unsubscribe] ** If this link doesn't work then send a message to: ** program-l-request@xxxxxxxxxxxxx ** and in the Subject line type ** unsubscribe ** For other list commands such as vacation mode, click on the ** immediately-following link:- ** [mailto:program-l-request@xxxxxxxxxxxxx?subject=faq] ** or send a message, to ** program-l-request@xxxxxxxxxxxxx with the Subject:- faq No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.423 / Virus Database: 270.14.33/2461 - Release Date: 10/26/09 20:22:00 ** To leave the list, click on the immediately-following link:- ** [mailto:program-l-request@xxxxxxxxxxxxx?subject=unsubscribe] ** If this link doesn't work then send a message to: ** program-l-request@xxxxxxxxxxxxx ** and in the Subject line type ** unsubscribe ** For other list commands such as vacation mode, click on the ** immediately-following link:- ** [mailto:program-l-request@xxxxxxxxxxxxx?subject=faq] ** or send a message, to ** program-l-request@xxxxxxxxxxxxx with the Subject:- faq