Published: Jan 19 2013 / 10:41
They were introduced in .NET 4.0 to minimise the need to use overloads. I wrote about them at http://www.blackwasp.co.uk/CSharpOptionalParameters.aspx.
@BlackWasp, Afrina_Teuku is not actually interested in the question or the answer, they are instead interested in posting large amounts of spam. Just a quick look at their profile and related comment history confirms this.
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