Items dictionary .net code example

Example 1: c# dictionaries

IDictionary<int, string> dict = new Dictionary<int, string>();
        
//or

Dictionary<int, string> dict = new Dictionary<int, string>();

Example 2: how to add object in dictionary in c#

public TValue this[TKey key]
{
    get
    {
        int index = this.FindEntry(key);
        if (index >= 0)
        {
            return this.entries[index].value;
        }
        ThrowHelper.ThrowKeyNotFoundException();
        return default(TValue);
    }
    set
    {
        this.Insert(key, value, false);
    }
}