Question

Is there any difference between

if(string.Empty.Equals(text))

and

if(text.Equals(string.Empty))

concerning performance, unexpected behaviour or readability?

Answer 1

These will have the same performance characteristics.

If text is null, your second line with throw a NullReferenceException.

Personally I find:

if(text == string.Empty)

More readable than either your options.

And there are the built in:

if(string.IsNullOrEmpty(text))

And for .NET 4.0:

if(string.IsNullOrWhitespace(text))