C# optional parameters

// Using Optional Attribute
private void SomeMethod([Optional] string param)
{
    ...
}

// Using Default Values
private void SomeMethod(string param = null)
{
    ...
}

Source: c-sharpcorner.com

Optional parameter get request c#

public string GetFindBooks(string author="", string title="", string isbn="", string  somethingelse="", DateTime? date= null) 
{
    // ...
}

Source: stackoverflow.com

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