XmlConvert.VerifyPublicId Method (String)
Returns the passed in string instance if all the characters in the string argument are valid public id characters.
Assembly: System.Xml (in System.Xml.dll)
No other values than the passed in argument should be returned. The characters valid for public id do not vary between XML editions, so no XmlVersion overload is required.
See XML 1.0 spec (fourth edition) production  PublidChar for details on the allowed characters
If the parameter is null, an ArgumentNullException will be thrown. If any of the characters are not valid public id characters, an XmlException is thrown with information about the first invalid character encountered.
Available since 4.5
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Available since 3.0
Windows Phone Silverlight
Available since 7.0
Available since 8.1