Is Smart.Format compatible with string.Format?

Absolutely. The core of Smart.Format supports all the features of String.Format. You can read about the standard features of String.Format [[at Microsoft's Composite Formatting reference page|http://msdn.microsoft.com/en-us/library/txafckwd.aspx]]. The main features are:

Numbered Placeholders

Numbers correspond to the argument index:

Smart.Format("{0} {1}", "Hello", "World");
// Outputs: "Hello World"

Item Formats

Determines how to format items, such as numbers and dates:

Smart.Format("{0:N3} | {1:MMMM, yyyy}", 5.5, new DateTime(2010,3,4));
// Outputs: "5.500 | March, 2010"

Alignment

Inserts spaces before or after the item, aligning it with other items:

Smart.Format("|{0,-10}|{1,10}|", "Left", "Right");
// Outputs: "|Left      |     Right|"

Brace Escaping

Escape braces using double-braces:

Smart.Format("{{0}} {{{0}}} {{}}", "Zero");
// Outputs: "{0} {Zero} {}"

Localization

Smart.Format uses the current culture info for formatting, or you can supply your own IFormatProvider:

Smart.Format(CultureInfo.GetCultureInfo("en-US"), "{0:C}", 1234) // Outputs: "$1,234.00"
Smart.Format(CultureInfo.GetCultureInfo("ja-JP"), "{0:C}", 1234) // Outputs: "¥1234"