BindingList

Add item to list

BindingList<string> listOfUIItems = new BindingList<string>();
listOfUIItems.Add("Alice");
listOfUIItems.Add("Bob");

Avoiding N*2 iteration

This is placed in a Windows Forms event handler

var nameList = new BindingList<string>();
ComboBox1.DataSource = nameList;
for(long i = 0; i < 10000; i++ ) {
    nameList.AddRange(new [] {"Alice", "Bob", "Carol" });
} 

This takes a long time to execute, to fix, do the below:

var nameList = new BindingList<string>();
ComboBox1.DataSource = nameList;
nameList.RaiseListChangedEvents = false;
for(long i = 0; i < 10000; i++ ) {
    nameList.AddRange(new [] {"Alice", "Bob", "Carol" });
} 
nameList.RaiseListChangedEvents = true;
nameList.ResetBindings();