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Rec and xRec how to use

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I want to print the Instructor Name for the selected record when I open the page.
And I have those two system variables Rec and xRec, that seems work the same way.
I was reading stuff, but the only useful info I found was this https://www.oreilly.com/library/view/programming-microsoft-dynamics/9781786468192/35ee3208-3f84-40b0-931e-bb438b49a1eb.xhtml

The page says "Rec represents the current record data in process and xRec represents the record data before it was modified."
That is simple to understand, but it's just too vague for me to comprehend .

In the first and third  piece of code I have the same result each time.
In the second piece, I got a different result according the one I'm clicking.

If isn't asking too much, I would like for someone to explain why those results are happening, which one should I use in similar attempts 
and if possible, very simple examples of both

I'm a NAV starter, I came from a C# background so OOP explanations can also help

PS: The FINDFIRST isn't important (I think it's not perfectly used,) I just put there because  I don't know yet a way to know if there's records, so I figured out that if there's record there's at least one record FINDFIRST would work

OnOpenPage()

IF Rec.FINDFIRST = TRUE THEN 
BEGIN


MESSAGE(FORMAT(Rec."Instructor Name"));
END
ELSE




OnOpenPage()


IF xRec.FINDFIRST = TRUE THEN 
BEGIN


MESSAGE(FORMAT(Rec."Instructor Name"));
END
ELSE

// or 

IF xRec.FINDFIRST = TRUE THEN 
  BEGIN
    //texto:= Rec.GETFILTER("Formation Code");
    
    MESSAGE(FORMAT(xRec."Instructor Name"));
    END
    ELSE 

  • Suggested answer
    Nitin Verma Profile Picture
    Nitin Verma 21,091 Super User 2024 Season 1 on at
    RE: Rec and xRec how to use

    Rec represents the current record data in process and xRec represents the record data before it was modified.

    So use always Rec.Findfirst until you require your last value (before modification)

    Cheers!

  • RE: Rec and xRec how to use
    [quote user="Nitin Verma"]

    Ok

    IF FINDFIRST THEN

     MESSAGE('%1',"Instructor Name");

    It will display FIRST RECORD name.

    [/quote]


    What does this code MESSAGE('%1',"Instructor Name"); means 

    I don't need to get the first value or other value, bro. That's just a simple code that I wrote to use Rec and xRec
    Just that, I know what happens, but I don't know why
    I want to know why my two similar codes work different, I want an explanation about my code, how /when to use Rec and xRec.



  • Suggested answer
    Nitin Verma Profile Picture
    Nitin Verma 21,091 Super User 2024 Season 1 on at
    RE: Rec and xRec how to use

    Ok

    IF FINDFIRST THEN

     MESSAGE('%1',"Instructor Name");

    It will display FIRST RECORD name.

  • RE: Rec and xRec how to use
    [quote user="Nitin Verma"]

    One Quick questions:

    1. Is this list page or Card page?

    [/quote]

    It's a List page, but the message is showing on opening the Card page

  • Nitin Verma Profile Picture
    Nitin Verma 21,091 Super User 2024 Season 1 on at
    RE: Rec and xRec how to use

    One Quick questions:

    1. Is this list page or Card page?

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