'Declaration

<DescriptionAttribute("The list of characters, which are allowable in recognizing text.")>
<DefaultValueAttribute(null)>
Public Overridable Property CharWhiteList As System.String

[Description("The list of characters, which are allowable in recognizing text.")]
[DefaultValue(null)]
public virtual System.String CharWhiteList { get; set; }

[Description("The list of characters, which are allowable in recognizing text.")]
[DefaultValue(null)]
public: __property virtual System.String get_CharWhiteList();
public: __property virtual void set_CharWhiteList(
   System.String value
);

[Description("The list of characters, which are allowable in recognizing text.")]
[DefaultValue(null)]
public:
virtual property System.String CharWhiteList {
   System.String get();
   void set(System.String value);
}

null - recognized text may contain any character; not null - recognized text may contain only specified characters.
Default value is null.
For example, string "1234567890" means that recognized text may contain digits only.