Question

Possible Duplicates:
Exception during iteration on collection and remove items from that collection
How to remove elements from a generic list while iterating around it?
Better way to remove matched items from a list

// tmpClientList is List<Client> type

if (txtboxClientName.Text != "")
    foreach (Client cli in tmpClientList)
        if (cli.Name != txtboxClientName.Text)
            tmpClientList.Remove(cli);

Error: “Collection was modified; enumeration operation may not execute.”

How can i remove items from the list, in some simple way, without saving indexes of these items in another list or array, and removing them in another place in the code. Tried also RemoveAt(index) but it’s exactly the same situation, modifying when loop runs.

Answer 1

The problem is that you are trying the modify the list in a foreach iteration. Replace that with a for and you should be ok.

Also, since you seem to be using user input for the name, consider cleaning up the input a bit, at least with a Trim() to remove extra white spaces. If you don’t, ‘John ‘ and ‘John’ will be two different things.
Same for the initial != “” check.