C# and SQL LIKE condition: '%' works as single-character wildcard -

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i have query in dataset (database located in .mdf file):

select * tablename somefield @param

table tablename contains record Значение in somefield field.

when @param Значени% it's works perfectly, when @param Значен% or Значе%, it's returns 0 rows. Значе%%% works.

why '%' works single-character wildcard?

your problem should using @param of nvarchar, not nchar

declare @param nchar(255) set @param = n'Значе%'

this really

n'Значе%             ...' (many more spaces)

so won't match data, 

n'Значение             ...' (padded spaces)

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