Entity Framework and Case Insensitive String Search

I have a Entity Framework entity with a string Property named Description.

Searching for all entities where the Description contains a string is as simple as:

var res = from u ctx.Users where u.Description.contains(str) select u;

But suppose I want t开发者_C百科o support case insensitive search?

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If you're using Linq to enties the search is done by the sql server so if the search is case sensitive or not depends on server settings.