Error using Binary Search of List

[ThatThatGuy]

How can i search for Rectangle object in a List<T> using BinarySearch() method of List<T>
.....

as i'm getting this error failed to compare two elements in a array...

the program works fine when the List is of Type String but fails when it's any thing other e.g Rectangle

any help is kindly appreciated

[tlhintoq]

Have you read the MSDN on BinarySearch?

[ThatThatGuy]

i had done all sorts of research be it on web or the local msdn.....
all the examples use String and not any other kind of objects

[tlhintoq]

So then you read the MSDN on BinarySearch.
The error you are getting is explained at the top of the page.

Exceptions
Exception type Condition
InvalidOperatio nException
The default comparer Comparer.Defaul t cannot find an implementation of the IComparable generic interface or the IComparable interface for type T.

Remarks
This method uses the default comparer Comparer.Defaul t for type T to determine the order of list elements. The Comparer.Defaul t property checks whether type T implements the IComparable generic interface and uses that implementation, if available. If not, Comparer.Defaul t checks whether type T implements the IComparable interface. If type T does not implement either interface, Comparer.Defaul t throws an InvalidOperatio nException.