Is it possible to create an object without a class in C#?

Anonymous Types is what you looking for. Eg -

var v = new { Amount = 108, Message = "Hello" };

Above code will create a new object with properties Amount and Message.

Yes there is ExpandoObject under System.Dynamic namespace.You could add properties on the fly like you do in other dynamic languages

dynamic dynObject = new ExpandoObject();
dynObject.someProperty= "Value";

http://msdn.microsoft.com/en-us/library/system.dynamic.expandoobject.aspx

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