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in this video ill demonstrate how to remove an item from a list in c sharp well start with something that you may have tried but received an error on on line one here we create our values variable its a list of strings containing the strings a b c and d what some people have tried is doing a for each loop to go through the values in the values list and if the value matches some criteria it will say values.remove and then try to pull out that item unfortunately if you run this you get an error message collection was modified enumeration operation may not execute and what this means is in this for each loop when the programmer tries to run this it knows how many elements are in the values list and it knows where its at in that list it has kind of a pointer in memory but if we try to remove an item while were looping through that list or if we try to insert an item while were looping through that list that changes the number of elements in the values list and that throws off the loo