What is the different between stringvariable != NullValue.String and !string.IsNullOrEmpty(stringvariable) in asp.net? -

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is there different between stringvariable != nullvalue.string , !string.isnullorempty(stringvariable) in asp.net ? best ?

the first tests string isn't "".

as strings can null (because references) test fail.

by using isnullorempty wrapping:

if (string != null && string.length > 0)

in 1 test.


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