using System.Collections.Generic;

// create
Dictionary<int, bool> MyDictionary = new Dictionary<int, bool>();

// fill
MyDictionary.Add(1, true);

// iterate
foreach (KeyValuePair<int, bool> dictitem in MyDictionary)
                {
                    if (dictitem.Key == 1)
                        // ...
                }
}

Working with System.Collections.Generic.Dictionary

Dictionary - Create, Fill, Iterate

C#