Extension Method for returning default values

static class ExtensionsThatWillAppearOnEverything
{
    public static T IfDefaultGiveMe<T>(this T value, T alternate)
    {
        if (value.Equals(default(T))) return alternate;
        return value;
    }
}

var result = query.FirstOrDefault().IfDefaultGiveMe(otherDefaultValue);

Or we can use the one shown below ,though its not an extension method.

 var result = query.FirstOrDefault() ?? otherDefaultValue;

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