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The following is the normative grammar for a string that is used as a name or key in Silverlight.
XamlName ::= NameStartChar (NameChar)* NameStartChar ::= LetterCharacter | '_' NameChar ::= NameStartChar | DecimalDigit LetterCharacter ::= ('a'-'z') | ('A'–'Z') DecimalDigit ::= '0'-'9' CombiningCharacter::= none
Characters are restricted to the lower ASCII range, and more specifically to Roman alphabet uppercase and lowercase letters, digits, and the underscore (_) character.
The Unicode character range is not supported.
A name cannot begin with a digit. Some tool implementations prepend an underscore (_) to a string if the user supplies a digit as the initial character.