funcrion  AddKeyAndValue(Const AKey,AValue:string):boolean;


Description:


Add key and value to the TUserData instance;


Parameter:


 AKey: a key for the user define property, it is a string;

 AValue: the value, it is a string;


Returns:


true: add success;

false: add failed, if  the key is existed, will return false;


Examples:


 UserData1.AddKeyandValue('Name','John');