How do I do a case insensitive search when using linq iqueryable

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C#

MVC5

Hi
I am having an issue, i am building a search screen which returns a list from a web service call as well as my Entity Framework Database.

I have built a my linq query using filters based on what user would like to search for
the issue is results are only returned if the casing on the query matches what is stored in the database.

What I have tried:

This is the query i am currently running when trying to search

var deleg = ExpressionBuilder.GetExpression<customer>(filters).Compile();
IQueryable<customer> portalResults = this.DbContext.Customers.Where(deleg).AsQueryable();