`Is` Casting in C#

iscast.cs

/**
 * Example with `is` that creates a casted item.
 */

public void onSomethingHappens(object sender, EventArgs args)
{
    if (sender is XmlDocument xmlDoc)
    {
        
    }
    else if (sender is IDictionary<int, object> dictIntegers)
    {
        foreach (KeyValuePair<int, object> kp in dictIntegers.)
        {
            Console.WriteLine($"{kp.Key} => {kp.Value}");
        }
    }
}