How to get content type id?

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C#

Hi,
How can i get content type id.i tried this link
http://www.enjoysharepoint.com/Articles/Details/how-to-get-content-type-id-of-sharepoint-2013-list-20878.aspx[^]

here is my code:

ContentType ct = web.ContentTypes.GetById("0x0100DA3291E4FB24C240AD3A3249C0AC810A 00588AA61F9F3E674292885C31350509AB");
list.ContentTypes.AddExistingContentType(ct);
clientcontext.ExecuteQuery();

when i tried im getting exception:

An unhandled exception of type 'Microsoft.SharePoint.Client.ServerException' occurred in Microsoft.SharePoint.Client.Runtime.dll<br />

Additional information: Value does not fall within the expected range.