ASP.NET MVC 3 Linq uppercase or lowercase database search

I need immediate help. ): and i know little english.

ASP.NET MVC 3 Linq uppercase or lowercase contains search

Example:

string metin="baris";

var IcerikAra = (from icerik in Context.dbDokumanEditor
join kategori in Context.dbDokumanKategori on 
icerik.KategoriID equals kategori.KategoriID
where icerik.Icerik.toLower().Contains(metin)
select new { 
KategoriID=kategori.
KategoriAd=kategori.KategoriAd
}).ToList();

Exception: StackTrace:

at System.Data.EntityClient.EntityCommandDefinition.ExecuteStoreCommands(EntityCommandentityCommand, CommandBehavior behavior)
at System.Data.Objects.Internal.ObjectQueryExecutionPlan.Execute[TResultType](ObjectContext context, ObjectParameterCollection parameterValues)
at System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)
at System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable.GetEnumerator()
at System.Data.Entity.Internal.Linq.InternalQuery`1.GetEnumerator()
at System.Data.Entity.Infrastructure.DbQuery`1.System.Collections.Generic.IEnumerable.GetEnumerator()
at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
at Plus.Areas.DokumanEditor.Controllers.DokumanController.DokumanIcerikAramaBaslat(String metin)

Error Message: An error occurred while executing the command definition. See the inner exception for details.

thanks..

Answer

i solved as follows:

database datatype text -> old
database datatype nvarchar(MAX) -> new

var IcerikAra = (from icerik in Context.dbDokumanEditor
                 join kategori in Context.dbDokumanKategori on icerik.KategoriID equals kategori.KategoriID
where icerik.Icerik.ToLower().Contains(metin)
select new { 
     KategoriID=kategori.KategoriID,
     KategoriAd=kategori.KategoriAd
}).ToList();

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