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How do i start reading a text file from a specific point?

So my question is basically, how do i start reading a file from a specific line, like for example line 14 until line 18?
Im working on a simple ContactList app and the only thing missing is deleting the information from a specific name. The user can create a new contact which has a name, a number and an address as information. I want the user to also be able to delete the data of that person by typing in their name. Then, the program should read the name and all of the 4 lines under it and remove them from the text File. How could i achieve this?

You can jump to any offset within a file. However, there isn't any way to know where a particular line begins unless you know the length of every line.
If you are writing a contact app, you should not use a regular text file unless:
You pad line lengths so that you can easily calculate the position of each line.
You are loading the entire file into memory.

You can't. You need to read the first n lines in order to find out which line has which number. Except if your records have a fixed length per line (which is not a good idea - there's always someone with a longer name that you could think of).
Likewise, you can't delete a line from the text file. The space on disk does not move by itself. You need an algorithm that implements safe saving and rearranges the data:
foreach line in input_file:
if line is needed:
write line to temporary_output_file
else:
ignore (don't write = delete)
delete input_file
move temporary_output_file to input_file
Disadvantage: you need about double the disk space while input_file and temporary_output_file both exist.
With safe saving, the NTFS file system driver will give the moved file the same time stamp that it had before deleting the file. Read the Windows Internals 7 book (should be part 2, chapter 11) to understand it in detail.
Depending on how large the contact list is (probably it's less than 10M entries), there's no problem of loading the whole database into memory, deleting the record and then writing everything back.

Weighing Scale Barcode Reader C#

how can I convert an EAN-13 or Code-128 barcode generated from a weighing scale machine back to a user-defined object?
Class Product
{
string name = "Apples";
deciaml qty = "0.5";
double value = "5";
}
I already found libraries but all decodes barcode provided as an image. in my case, I have a barcode reader which will be reading the barcode label and input it as numbers something like (2032156478954).
what library or how can I decode those barcode numbers back to my object?
assume that I know from the user manual of the weighing scale which part is the product name, qty, and value
just like those label barcode we see in hypermarkets where you buy fruits and veggies in KG or Gram, it prints a barcode label, then the barcode label on POS is converted back to product object.
I am totally new when it comes to handling barcodes in .NET, any help, suggestion, or advice will be appreciated.
Example of Weighing Scale Barcode

Currently, I have solved it by implementing my own solution.
assume the barcode is 2 53647 2 5262 9 (EAN-13)
from the left-hand side, 2 tells the POS this is a barcode from the weighing scale machine, 53647 will be the ID of the item in the database.
2 tells the POS next 5 digits are the price of the item (52.62)
the last digit always discarded
the downside of this method is you will have to change either the settings of your weighing machine for every new setup you make to match your function. or you will change your code to match how the machine is printing barcodes since there is no one international standard.
I was hoping for a library that would have built-in functionality to recognize and decode those barcodes based on leading numbers and other check numbers. I might start building my own after looking at the most used formats.

If you already have a the string, as others pointed out you theoretically just nid to split the barcode and fill you class.
If you have a look here:
https://www.codeproject.com/Articles/10162/Creating-EAN-13-Barcodes-with-C
It shows you what the single numbers mean.
However:
If you want to figure out the values behind the numbers, then thats a little bit tricky. I expect the manufacturer code, if internationally standardized is something that will change over time. Because someone registers a new manufacturer and therefore gets a new code.
This would imply your programm needs access to the internet resp. to this database where they are registered.
Before putting to much effort in it, ask you self:
Do I really need to have this informations that well prepared, for the project am I'm doing or would it be completely fine if you just split the strings and have as manufacturer for example "50603" without knowing whats behind.
I just give you this sample for the EAN code, but I would say you can apply this to other codes as well.

SSML - Is it possible to remove automatic break pauses?

I'm trying to remove the automatic breaks added by the synthesis processor, to create speech files without any "linguistic pauses".
I'm using Microsoft's speech synthesis engine with the SpeechSynthesizer class in C#.
This is the output I get with "This is an example why do automatic breaks occur?" wrapped in <speak> tags with SpeechSynthesizer:
https://clyp.it/4nofhh3n
This is the output I want (achieved by using Oddcast's TTS Demo):
https://clyp.it/m55wt14u
I've read through w3.org's SSML documentation several times which in point 3.2.3 - break element, note the following:
If the element is not present between tokens, the synthesis processor is expected to automatically determine a break based on the linguistic context. In practice, the break element is most often used to override the typical automatic behavior of a synthesis processor.
This is how my voice is currently behaving. I want to somehow override/turn off this functionality, and have the speech be completely uninterrupted. I have tried putting a <break> element with attributes strength="none" and time="0ms" between the words where this automatic break occurs like they write above to override it, and all kinds of different things such as wrapping the whole text string in <s> tags etc, to no avail.
I also can't just remove the breaks in post processing, since the voice has a different tone on the words spoken, when the automatic breaks are added.
I have read through several different SSML documentations which, while often worded a bit differently compared to the w3 docs, don't explain how to concretely override the automatic breaks, which is my issue.

In my experimenting with SpeechSynthesizer if you put a break of 50ms at the end then it will respect it - if it's less then it'll be ignored.
However, it will always treat <speak> wrapped content as its own clause, so will speak it as if it's a sentence/clause, rather than carrying the prosody like the 2nd example. You need to send all your text in a single <speak> element (and voice) to have it treated as a single linguistic utterance.

How can I run built-in Revit commands from C#

I am wanting to know if there is a methodology to feed calculated values to a built-in Revit command from inside a C# program, and then possibly (based on results, such as whether this makes an element too short or too long for a known "maximum span" of a particular beam) continue with my C# program and change the beam size). I am told you can invoke the Revit built-in command after execution of your c# external command, but you cannot then return to the c# program
As another example, I want to select an element to trim/extend to, and have the code figure out which "Joist" beams to extend to this element. My program would do extended filtering (such as "Reference Level", or "Workset", or "Comments", or "Mark" parameters (etc.)) and then run the built in function, providing the element to extend to and then each of my beams.
I've tried internet searches, as well as the Revit SDK samples, and nothing obviously used this (but there are a lot of csproj's to look through).
Can anyone verify that you cannot go back and forth between the C# program and the Revit built-in command?

You can programmatically invoke a built in Revit command with the UIApplication.PostCommand() method. Refer to documentation and building coder for more information. It will not execute until after the API context is over, however.
I don't think you'll be able to feed arguments into the command however, short of some kind of Win32 hack. Perhaps you will need to recreate the functionality of the built in command within the Revit API.
Unfortunately, I don't think we can do (command "_line" pnt1 pnt2) type of thing here.

Perhaps start with the SDK sample "MoveLinear". It shows how to modify end points of linear elements (which includes beams).
The main part of the sample's code is
Autodesk.Revit.DB.Line line;
//get start point via "get_EndPoint(0)"
Autodesk.Revit.DB.XYZ newStart = new XYZ(
lineLoc.Curve.GetEndPoint(0).X + 100,
lineLoc.Curve.GetEndPoint(0).Y,
lineLoc.Curve.GetEndPoint(0).Z);
//get end point via "get_EndPoint(1)"
Autodesk.Revit.DB.XYZ newEnd = new XYZ(
lineLoc.Curve.GetEndPoint(1).X,
lineLoc.Curve.GetEndPoint(1).Y + 100,
lineLoc.Curve.GetEndPoint(1).Z);
//get a new line and use it to move current element
//with property "Autodesk.Revit.DB.LocationCurve.Curve"
line = Line.CreateBound(newStart, newEnd);
lineLoc.Curve = line;
Which moves the X of the first point and the Y of the second point 100 feet.

you can try:
RevitCommandId commandId = RevitCommandId.LookupPostableCommandId(PostableCommand.PlaceAComponent);
commandData.Application.PostCommand(commandId);

decrypt an encrypted value?

I have an old Paradox database (I can convert it to Access 2007) which contains more then 200,000 records. This database has two columns: the first one is named "Word" and the second one is named "Mean". It is a dictionary database and my client wants to convert this old database to ASP.NET and SQL.
However, we don't know what key or method is used to encrypt or encode the "Mean" column which is in the Unicode format. The software itself has been written in Delphi 7 and we don't have the source code. My client only knows the credentials for logging in to database. The problem is decoding the Mean column.
What I do have is the compiled windows application and the Paradox database. This software can decode the "Mean" column for each "Word" so the method and/or key is in its own compiled code(.exe) or one of the files in its directory.
For example, we know that in the following row the "Zymurgy"
exactly means "مبحث عمل تخمیر در شیمی علمی, تخمیر شناسی" since the application translates it like that. Here is what the record looks like when I open the database in Access:
Word Mean
Zymurgy 5OBnGguKPdDAd7L2lnvd9Lnf1mdd2zDBQRxngsCuirK5h91sVmy0kpRcue/+ql9ORmP99Mn/QZ4=
Therefore we're trying to discover how the value in the Mean column is converted to "مبحث عمل تخمیر در شیمی علمی, تخمیر شناسی". I think the "Mean" column value in above row is encoded in Base64 string format, but decoding the Base64 string does not yet result in the expected text.
The extensions for files in the win app directory are dll, CCC, DAT, exe (other than the main app file), SYS, FAM, MB, PX, TV, VAL.
Any kind of help is appreciated.
here is two more example and remember double quotes at start and end are not part of the strings:
word: "abdominal"
coded value: "vwtj0bmj7jdF9SS8sbrIalBoKMDvTbpraFgG4gP/G9GLx5iU/E98rQ=="
translation in Farsi: "شکمی, بطنی, وریدهای شکمی, ماهیان بطنی"
word: "cart"
coded value: "KHoCkDsIndb6OKjxVxsh+Ti+iA/ZqP9sz28e4/cQzMyLI+ToPbiLOaECWQ8XKXTz"
translation in Farsi: "ارابه, گاری, دوچرخه, چرخ, با گاری بردن"
here is the result in different encodings:
1- in unicode the result is: "ᩧ訋퀽矀箖�柖�섰᱁艧껀늊螹泝汖銴岔꫾也捆￉鹁"
2- in utf32 the result is: "��������������"
3- in utf7 the result is: "äàg\v=ÐÀw²ö{Ýô¹ßÖg]Û0ÁAgÀ®²¹ÝlVl´\\¹ïþª_NFcýôÉÿA"
4- in utf8 the result is: "��g\v�=��w���{����g]�0�Ag��������lVl���\\����_NFc����A�"
5- in 1256 the result is: "نàg\vٹ=ذہw²ِ–{فô¹كضg]غ0ءAg‚ہ®ٹ²¹‡فlVl´’”\\¹ï‏ھ_NFc‎ôةےA"
yet i discovered that the paradox database system is very complex when it comes to key management and most of the time the keys are "compound keys" and that's why it's problematic and that's why it's abandoned!
UPDATE: i'm trying to do the automation by using AutoIt v3 because the decryption process as i understand can't be done in one or two days. now i have another problem which is related to text/font. when i copy the translated text to notepad it will change to some unrecognizable text unless i change the font of notepad to the font of the translation software. if i type something in the notepad in Farsi it will show it correctly regardless of what font i've been chosen. more interesting is when i copy the text to any other program like MS Office Word it'll be shown correctly no matter what font i choose.
so how can i get around this ?

In this situation, I would think about writing a script/program to simply pull all the data out through the existing program.
You could write an application to send keypresses to the app which would select and copy each value in turn.
It would take a while to run, but you could just leave it overnight (how big is your database?) and it only has to run once.
Not sure how easy this would be, since I haven't seen this app of course - might this work?

Take a debugger like ollydbg/softice. Find the place where the mean is decoded/encoded and then step through the instructions one by one, check all registers to find out what is done. I have done so numerous times. That should help you getting started, since you have the application which is able to decode this stuff. You also have a reference word. That's all you need.
Also take into consideration: Unicode can be Little or Big Endian. So you might try swapping the bytes. UTF-8 can be a pain, since some words are stored as one byte and some as two bytes.
You can also try to take words which are almost identical in Farsi and try to compare the outputs. That could lead to a reconstruction of a custom code page, if there is one.