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ReSharper lets you use any code symbols (classes, methods, properties, fields, variables etc.) before you declare them. When ReSharper detects an undeclared symbol, it suggests a quick-fix (for C#) or several context actions (for VB.NET) for generating the corresponding symbol based on the usage, and then smartly adjust the declaration according to the usage context:
Code_Generation__Generating_Code_from_Usage__quick-fixes.png

For example, if you create a method from usage, ReSharper will not only create a method, but also detect its return type and types of its parameters:
Code_Generation__Generating_Code_from_Usage__method.png

In the body of the generated method, ReSharper is able, depending on your settings, to throw new NotImplementedException(), return default value, or put code that will not compile. Choose ReSharper | Options | Languages | Common | Members Generation to select one of these 3 options.

For additional examples of how ReSharper creates code symbols from usages, see Undefined variable and Undefined method call samples in Examples of Quick-Fixes .

See Also

Procedures

Reference