nhibernate - How can I use "Expression.Not" with text field? -

I "expression" with text field. How can i use

I need to select all the records, for example, this code return runtime error from NHQuestionCount, excluding "katest"

  NHQuestionCount [] Stats = NHQuestionCount.FindAll (order .asc ("NameFull"), expression. (Not an expression ("name root", "katext"));  

I can not comment on my rest code, but your use of the expression is OK .