c# - Message BOX not showing up on InfoPath form -

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the message box should appear when view switched on form screen comes blank? i'm not sure why. tried adding reference windows.forms well

 using microsoft.office.infopath;  using system;  using system.xml;  using system.windows.forms;  using system.xml.xpath;  namespace form1 {     public partial class formcode     {       public void internalstartup()       {       }        public static dialogresult formevents_viewswitched(object sender, viewswitchedeventargs e)       {         string string1 = "error";         string string2 = "empty field found on form";         // set button of type "messageboxbutton"          messageboxbuttons button = messageboxbuttons.yesno;         // static method, referenced without object using class          return (messagebox.show(string1, string2, button));       }     } }

you should use following 

messagebox.show("display error message text here", "title appears on messagebox here", messageboxbuttons.yesno);

also google how use string.format or string.join or string.concat message


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