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Message: <blockquote data-quote="spiderwheels" data-source="post: 594487" data-attributes="member: 99116">String literals are not expensive to construct. There is no construction as they are already in there in the assembly. As you say, this:Log.Debug(string.Format("Some message: {0}",aString));is expensive as the string.Format is called regardless of the log level.In this instance the line should use the built in formatting methods of the Log class:Log.DebugFormat("Some message: {0}",aString);Now the parameters are passed to the DebugFormat method and formatting only takes place if Debug is enabled.</blockquote>