How to convert a colour image to grayscale

How to convert a colour image to grayscale Howtoconvertacolourimagetograyscale How to convert a colour image to grayscale [C#] J.Marc Piulachs /PreviewSnippet.aspx?SnippetID=f843c9d6-548c-4c94-abfc-c147625bd5b7 SurroundsWith