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how to serialize a long string and maintain the formatting?

I have a console application and writing a string content (a long comment you can say) through POST method to LiquidPlanner comment. I have a long string having some html tags and maintains a format like following.
When i am serializing through JsonConvert.SerializeObject then formatting of that comment is breaking and writing on other side as messy text as following.
i tried following link but was not helpful.
Link for serialization
how can serialize exact same ? is there any way please let me know asap, thank you in advance.

Cause of Error:
I solved the issue, actually what happening in original string you can see the new line so when this string pass into the string variable then .Net environment put \r\n on every new line and when i serialize from the newton.json library it put one more slash in \r and \n (\\r\\n) so when i POST the string in LiquidPlanner, LiquidPlanner fail to interpretate (\\r\\n) and write as text non formatted way.
Solution of Error:
what i did, i used regex and replaced the \\r\\n with tag from the serialized string and posted, and it worked for me.
string.Join("<br/>", System.Text.RegularExpressions.Regex.Split(createCommentJson, #"(?:\\r\\n|\\n|\\r)"));
and it posted in formatted way.
:)

"Evaluate" a c# string

I am reading a C# source file.
When I encounter a string, I want to get it's value.
For instance, in the following example:
public class MyClass
{
public MyClass()
{
string fileName = "C:\\Temp\\A Weird\"FileName";
}
}
I would like to retrieve
C:\Temp\A Weird"FileName
Is there an existing procedure to do that?
Coding a solution with all the possible cases should be quite tricky (#, escape sequences. ...).
I am convinced such procedure exists...
I would like to have the dual function too (to inject a string into a C# source file)
Thanks in advance.
Philippe
P.S:
I gave an example with a filename, but I look for a solution working for all kinds of strings.

I'm pretty sure you can use CodeDOM to read a C# code file and parse its elements. It generates a code tree, and then you can look for nodes representing strings.
http://www.codeproject.com/Articles/2502/C-CodeDOM-parser
Other CodeDom parsers:
http://www.codeproject.com/Articles/14383/An-Expression-Parser-for-CodeDom
NRefactory: https://github.com/icsharpcode/NRefactory and http://www.codeproject.com/Articles/408663/Using-NRefactory-for-analyzing-Csharp-code

There is a way of extracting these strings using a regular expression:
("(\\"|[^"])*")
This particular one works on your simple example and gives the filename (complete with leading and trailing quote characters); whether it would work on more complex ones I can't easily tell unfortunately.
For clarity, (\\"|[^"]) matches any character apart from ", except where it has a leading \ character.

Just use ".*" Regex to match all string values, then remove trailing inverted commas and unescape it.
this will allow \" and "" characters inside your string
so both "C:\\Temp\\A Weird\"FileName" and "Hello ""World""" will match

Replacing backslash in a string

I am having a few problems with trying to replace backslashes in a date string on C# .net.
So far I am using:
string.Replace(#"\","-")
but it hasnt done the replacement. Could anyone please help?

string.Replace does not modify the string itself but returns a new string, which most likely you are throwing away. Do this instead:
myString= myString.Replace(#"\","-");
On a side note, this kind of operation is usually seen in code that manually mucks around with formatted date strings. Most of the time there is a better way to do what you want (which is?) than things like this.

as all of them saying you need to take value back in the variable.
so it should be
val1= val1.Replace(#"\","-");
Or
val1= val1.Replace("\\","-");
but not only .. below one will not work
val1.Replace(#"\","-");

Use it this way.
oldstring = oldstring.Replace(#"\","-");
Look for String.Replace return type.
Its a function which returns a corrected string. If it would have simply changed old string then it would had a void return type.

You could also use:
myString = myString.Replace('\\', '-'));
but just letting you know, date slashes are usually forward ones /, and not backslashes \.

As suggested by others that String.Replace doesn't update the original string object but it returns a new string instead.
myString= myString.Replace(#"\","-");
It's worthwhile for you to understand that string is immutable in C# basically to make it thread-safe. More details about strings and why they are immutable please see links here and here

C# URL QueryString Trouble

I have a WP7 project where I am using the below code. It normally works ok, but I am getting a strange result with some particular strings being passed through.
Service = "3q%23L3t41tGfXQDTaZMbn%23w%3D%3D?f"
NavigationService.Navigate(new Uri("/Details.xaml?service=" + Service, UriKind.Relative));
Next Page:
NavigationContext.QueryString.TryGetValue("service", out Service1);
Service1 now = 3q#L3t41tGfXQDTaZMbn#w==?f
Why has the string changed?

The string hasn't changed, but you're looking at it in two different ways.
The way to encode 3q#L3t41tGfXQDTaZMbn#w==?f for as URI content is as 3q%23L3t41tGfXQDTaZMbn%23w%3D%3D?f. (Actually, it's 3q%23L3t41tGfXQDTaZMbn%23w%3D%3D%3Ff but you get away with the ? near the end not being properly escaped to %3F in this context).
Your means of writing the string, expects to receive it escaped.
Your means of reading the string, returns it unescaped.
Things are working pretty much perfectly, really.
When you need to write the string again, then just escape it again:
Service = Uri.EscapeDataString(Service1);

In your first code snippet the string is URL Encoded.
In the 2nd code snippet, the string is URL Decoded.
They are essentially the same strings, just with encoding applied/removed.
For example: urlencoding # you get %23
For further reading check out this wikipedia article on encoding.
Since HttpUtility isn't part of WP7 Silverlight stack, I'd recommend using Uri.EscapeUriString to escape any URI's that have not been escaped.

You should probably URL encode the string if you want it to pass through unscathed.

Html encode problem for server side strings

I am trying to do html encode on the below string which has quotes , buts it not working
The server returns with quotes for the string
string serverString= **“Test hello,”** // this is returned from database
serverString =HttpUtility.HtmlEncode(serverString);
i am getting this result
�Test helloI,�
but still its not replacing and i am getting some diamond symbols on the asp.net page
Can anybody tell me what am i doing wrong.

The quote characters you're seeing are perfectly legitimate characters from an HTML standpoint, so they don't need to be encoded by HtmlEncode. What you're most likely seeing is an issue with your browser's encoding not supporting those characters. See http://www.htmlbasictutor.ca/character-encoding.htm for more information.

Are you sure it's not a rendering issue? You might try a font like "Arial Unicode MS" to make sure the browser is rendering the characters properly.
You should also verify the string returned from the database is correct.
Lastly, it could help to share how you're writing serverString to your response stream. Some ASP.NET controls expect text and HTML-encode for you while others expect HTML and do not.

This is because the server is returning fancy double quotes (that's not the technical name for them) instead of regular double quotes. You could do something like this:
string serverString= "“Test hello,”";
serverString = HttpUtility.HtmlEncode(serverString)
// Replaces fancy left double quote with regular one
.Replace("\u2018", "'")
// Replaces fancy right double quote with regular one
.Replace("\u2019", "'");