@black

public List<object> Colvalue { get; set; }

First I'd like to say that List<object>'s defination isn't so good……List<T> for you to define a generic List of specific type T，and we don't use object。Maybe you can use ArrayList instead。

And now your main question is that you should add a single quote——

".Contains" + "('" + colv + "')";

Or just use parameter+value——

http://stackoverflow.com/questions/2455659/how-to-use-contains-or-like-in-a-dynamic-linq-query