sql server - Calling Stored Proc with CHAR Parameters results in a parameter with a huge value -

i calling stored proc [ms sql] using ef5 .net application

the call ef

return base.executefunction<sp_select_contracts_result>("sp_select_contracts", x, y, z); 

in proc parameter defined @para1 char(2) etc

but in sql profiler caught ef sending following

exec [dbo].[sp_select_contracts_statistics] @x='15                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              ' 

exactly - huge amount of spaces after actual value.

when change char varchar works correctly:

exec [dbo].[sp_select_contracts_statistics] @x='15','@y='24,@z='2010'

i work around easily, know missing here.

update: forgot mention in c# values strings. in last call c# before going through ef values correct: x = "15" {string} etc..

edit2: changing chars varchars worked expected. still prefer know if bug or missing.