Automatic Completion
ReSharper's automatic completion suggests names of classes, methods, variables, keywords, and any other symbols that are available within the current visibility scope including extension methods that were previously imported. Many other context-specific suggestions, like live templates, code generation suggestions, unit test categories are also available in the completion list.
By default, suggestions of automatic completion also include items from Smart Completion and Import Symbol Completion. If you want to change the default behavior, use the corresponding controls on the page of ReSharper options. The list of suggestions is the same as that of Basic Completion.
The suggestion list of the automatic completion appears as soon as you start typing. As you type, the list narrows down to show only items that match what you have entered.
By default, automatic completion support CamelHumps, i.e. you can type the initial letters of a compound name parts and the name will appear in the list of suggestions.
If necessary, you can disable CamelHumps by clearing the Match middle of identifiers check box on the page of ReSharper options.
Note that in most contexts, ReSharper tries to figure out which suggestion you will likely choose, and preselects it in the list. With the default settings, ReSharper inserts the selected item when you press Enter, Space or any non-alphanumeric character.
This may be confusing in the beginning, but there are ways to change the default behavior. First, you can choose not to preselect the guessed item as described below in this topic. Second, you can specify the characters on which the selected suggestion is inserted or not inserted. To do so, use the corresponding controls on the page of ReSharper options.
Configuring automatic completion
Automatic completion suggestions only appear if either ReSharper or Custom IntelliSense and the corresponding language is selected on the page of ReSharper options.
Automatic completion suggestions only appear if Enable Automatic IntelliSense Popup is checked on the page of ReSharper options.
On the page of ReSharper options, you can also tune the behavior of automatic completion for each language and context separately.
For each language and context combination, you can specify one of three kinds of behaviour:
- Do not display
- Display and preselect
When the suggestion list appears, ReSharper tries to guess what are you about to type and selects it for you in the list. If the proposed item is correct, just hit Enter or any non-alphanumeric character to go on with the suggested item. (See ReSharper Options | Environment | IntelliSense | Completion Characters to learn how to configure the insertion of the selected completion item.) - Display but do not preselect
This option just allows the pop-up to show the list of available items without selection so that you could choose one manually. When you hit Enter or any non-alphanumeric character the popup disappears and you can continue with what you've typed. However, the expected item in the pop-up is still highlighted with a blue frame, and if you see that the guess is correct, you can hit Ctrl+Enter to insert it.
For example, you can define the behavior after typing a dot in C# files. 
At the examples below you can see the effect of each setting. 
Examples of automatic completion
You can use the following examples to get an idea of how automatic completion works with various code items:
- Suggesting type-based variable names
- Suggesting members of a class
- Suggesting visible types
- Suggesting C# keywords
- Suggesting 'this' keyword for static methods in static classes
- Completion for enum members
- Using CamelHumps in code completion
- Completion for unresolved symbols
- Completion for argument names
- Suggesting members of a dynamic type
- Suggesting existing partial classes
- Applicability in different languages
Suggesting type-based variable names
Commonly used names for fields and variables are suggested depending on their type. If you enter a variable name prefix, ReSharper will append it to each suggested name: 
Suggesting members of a class
Suggesting visible types
Suggesting C# keywords
Suggesting 'this' keyword for static methods in static classes
Completion for enum members
Using CamelHumps in code completion
Completion for unresolved symbols
Early used names of data types and their members are suggested, even if they are not declared anywhere in the code and cannot be resolved. 
Completion for argument names
Suggesting members of a dynamic type
Suggesting existing partial classes
When you type partial class, names of partial classes in the current scope are added to the suggestions list, thus helping you to quickly create new parts of existing partial classes.
Applicability in different languages
This feature is supported in the following languages and technologies:
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The instructions and examples given here address the use of the feature in C#. For details specific to other languages, see corresponding topics in the ReSharper by Language section.