Binding Expressions for WPF and Silverlight provides the following unique key features:

• Support for Operators and Functions
  Perform simple operations (+, -, *, /) and functions directly in your binding statement. Supported functions include Sum, Average, and Concatenate. For a list of operators and functions, see C1Binding Expression Syntax Elements.
• Use Quotes without Breaking your XAML
  Use quotes in your binding expressions without breaking your XAML. C1Binding Expressions support inline quotes in two forms: " or use of the pipe (|) character.
• Logical Expressions
  Apply simple if/else logic directly in your binding statement. C1Binding supports an ‘IF’ function with the following syntax: if(condition, true value, false value).
• Clean and Expressive XAML
  By using C1Binding Expressions, your XAML will be much cleaner and more expressive. And it’s 100% self-contained. You do not need any external converters referenced from elsewhere in your solution.
• Calculation Engine
  In addition to the C1Binding class, the C1.Silverlight.Binding and C1.WPF.Binding assemblies provide a C1CalcEngine class that is responsible for evaluating the expressions. The C1CalcEngine class can be used independently of the C1Binding, to implement calculated input boxes, spreadsheets, and many other applications. See the C1CalcEngine class for more information and some usage scenarios.
• Silverlight 5 Support
  The C1.Silverlight.Binding classes require Silverlight 5. This is because they rely on MarkupExtensions, which are not available in earlier versions of Silverlight.