Simple C# Linq to Entities Query does not work

I keep getting an error with the code below. It says Error "Operator '==' cannot be applied to operands of type 'string' and 'int'. I have watched a video and Julie Lerman does the exact same thing. She doesn't get the error though. Why?

private static void CustomerQuery()
{
    var context = new NorthwindEntities();
    var query开发者_StackOverflow中文版 = from c in context.Customers
                where c.CustomerID == 5
                select c;

    var customers = query.FirstOrDefault();
}

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Check the data type of CustomerID. Else convert them to int.

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thats it,check the type of customer id in table ,if it is string change the query to

private static void CustomerQuery()

       {
            var context = new NorthwindEntities();
            var query = from c in context.Customers
                        where c.CustomerID == "5"  
                        select c;

            var customers = query.FirstOrDefault();
        }

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try with where c.CustomerID == "5" instead.

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It seems that CustomerID is not of type int. Typecast it to int to compare it with an int datatype.