Which is more efficient? String.Format() or String.Replace()?

My guess is that format is faster because you basically supply the template for it to use and it puts what you have into it. Replace has to search for the characters throughout the string.

However I doubt you would ever see a noticeable difference in the two.

The only prob with format is that you do have to validate the string prior to running to make sure it will fit in the format you desire.

I agree with the previous answer in that the performance difference would probably be un-noticeable. We tend to forget how fast functions that are working on data that's entirely in memory actually execute.

A good reason to go with Replace over Format would be clarity. If I am reading your code and I see Replace it's immediately obvious to be that you are replacing character, but if I see Format it may take me a little time to realize you are using it to do a replace.

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