lambda expression for OR condition in Linq to entity

I have the following condition. VersionNumber == versionID + ".pdf" OR VersionNumber ==开发者_如何学运维 versionID + ".null"

This is not taking this way

var versionExisting = entities.Documents.Where(d => d.VersionNumber == versionID + ".pdf" || d => d.VersionNumber == versionID + ".null");

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Do this:

var versionExisting = entities.Documents.Where(d => d.VersionNumber == versionID + ".pdf" || d.VersionNumber == versionID + ".null");