Use simple 'using' statement (IDE0063)

Property Value
Rule ID IDE0063
Title Use simple using statement
Category Style
Subcategory Language rules (code block preferences)
Applicable languages C# 8.0+
Options csharp_prefer_simple_using_statement


This style rule concerns the use of using statements without curly braces, also known as using declarations. This alternative syntax was introduced in C# 8.0.


Options specify the behavior that you want the rule to enforce. For information about configuring options, see Option format.


Property Value Description
Option name csharp_prefer_simple_using_statement
Option values true Prefer to use a using declaration
false Prefer to use a using statement with curly braces
Default option value true
// csharp_prefer_simple_using_statement = true
using var a = b;

// csharp_prefer_simple_using_statement = false
using (var a = b) { }

Suppress a warning

If you want to suppress only a single violation, add preprocessor directives to your source file to disable and then re-enable the rule.

#pragma warning disable IDE0063
// The code that's violating the rule is on this line.
#pragma warning restore IDE0063

To disable the rule for a file, folder, or project, set its severity to none in the configuration file.

dotnet_diagnostic.IDE0063.severity = none

To disable all of the code-style rules, set the severity for the category Style to none in the configuration file.

dotnet_analyzer_diagnostic.category-Style.severity = none

For more information, see How to suppress code analysis warnings.

See also