Removing Items in a List While Iterating Through It with For Each Loop

Question

I have a list named NeededList I need to check each item in this list to see if it exists in my database. If it does exist in the database I need to remove it

Answer 1

Go for safe and make a copy with ToList():

For Each Needed In NeededList.ToList()
    Dim Ticker = Needed.Split("-")(0).Trim()
    ...
    If dr.HasRows Then
        NeededList.Remove(Needed)
    End If
Next