Auto Using and Add Include Directives
Visual Assist X helps you locate and insert language-specific statements to reference undeclared identifiers in your code, such as using directives in C# or #include directives in C/C++.
Automatically Add Using Directives in C#
When you reference a common .NET type in your code when the associated using directive hasn't been added yet, Visual Assist X suggests adding the directive. When you accept the suggestion, the directive is inserted at the top of the current file without changing the position of the text caret.
Unlike the similar Visual Studio feature, Visual Assist X presents the using suggestion as you type -- there is no need to expand a smart tag to see the option.
Add Include Directives in C/C++
Hover over an undeclared identifier and choose "Add include xxxx" from the refactoring context menu to insert the appropriate directive at the top of the file. The position of the text caret is unchanged.