Pro C# and the .NET framework is a good one, but Wrox and Adison Wesley both publish generally execlent books. Avoid anything with multiple exclamation marks, "in xxx days", or "for dummies" in the title. If possible, get something in your native language (whatever that is) - it's a lot easier to understand new material when you don't have to try and translate new terms at the same time! But whatever book you get, start at the beginning, and work through: do the exercises, even if they seem trivial - you learn best by doing, not reading the answers. Books tend to be organised so they build on previous material, and skipping a chapter or two can mean that you miss a lot of useful stuff!
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