C# Language Tutorial => Avoiding N*2 iteration

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Fastest Entity Framework Extensions

Example

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();

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