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C# substring after specific sign

how can I get a value of the string after last'/'
string path=http://localhost:26952/Images/Users/John.jpg
I would like to have as a result something like :
John.jpg

I think using Path.GetFileName method is a better way instead of string manipulation.
string path = "http://localhost:26952/Images/Users/John.jpg";
var result = Path.GetFileName(path);
Console.WriteLine(result); // John.jpg

Split by '/' and get the last part:
var url = "http://localhost:26952/Images/Users/John.jpg";
var imageName = url.Split('/').Last();

Add a directory name to a URL address using C#

I have a textbox where users can paste a URL address. I want to add a directory name to the URL before saving it in the database.
<asp:TextBox ID="urlTextbox" runat="server"></asp:TextBox>
Code behind
TextBox url = urlTextbox as TextBox;
string urlString = urlTextbox.Text;
Let's say the urlString = "mydomain.com/123456". I want to replace it with "mydomain.com/directory/123456". mydomain.com/directory is the same for all the URLs. The last part "123456" changes only.
Thank you

I'd suggest seeing if your needs are met with the UriBuilder class.
UriBuilder url = new UriBuilder(urlTextbox.Text);
Now you can use the various properties to change your url.
string formattedUrl = string.Format("{0}://{1}/directory/{2}", url.Scheme, url.Host, url.Path);
A better idea is to adjust the URL with another / same UriBuilder as noted by Jared.
UriBuilder url = new UriBuilder(urlTextbox.Text);
url.Path = string.Format("directory/{0}", url.Path);
Use this object as a Uri by simply doing this
Uri formattedUrl = url.Uri;
Or convert to a string if needed.
string formattedUrl = url.ToString();
You can also use Uri.TryParse(...) to verify if it's a valid URL being entered into the text box.
To get the individual query parameters, you can look at the Uri object.
UriBuilder url = new UriBuilder("mydomain.com/123456?qs=aaa&bg=bbb&pg=ccc");
url.Path = string.Format("directory/{0}", url.Path);
Uri formattedUrl = url.Uri;
string queryString = formattedUrl.Query;
// parse the query into a dictionary
var parameters = HttpUtility.ParseQueryString(queryString);
// get your parameters
string qs = parameters.Get("qs");
string bg = parameters.Get("bg");
string pg = parameters.Get("pg");

You can use string functions Split and Join to achieve your result. An example code is shown below
List<string> parts = urlString.Split(new char[] { '/'}).ToList();
parts.Insert(parts.Count - 1, "directory");
urlString = string.Join("/", parts);

This is one way of doing. Split the urlString using .split() function.
string[] parts = urlString.Split('/');
parts[parts.Length-1] will have that number. Append it to the string you want.

I'd do something like this:
//Assuming the address in urlString has the format mydomain.com/123456
string[] urlParts = urlString.Split('/');
string directory = "directory";
string finalUrl = urlParts[0] + "/" + directory + "/" + urlParts[1];
Be careful if the address has other "/" characters, like if preceded by http:// or something like that.
Hope it helps.

Simply use concatenation:
save in a temporary string
temp="mydomain.com/directory/"
and save the changing part in another string like
temp2="123456"
now concatenate both temp1 and temp2 like below.
urlString=temp1+temp2;

Find and replace content within string (C#)

The below string is coming from a DIV tag. So I have enclosed the value below.
String cLocation = "'target="_blank'></a><img alt='testimage.jpg' src='/SPECIMAGE/testimage.jpg'"
I would like to replace in the above string by changing "src="/" with "src='xyz/files'".
I have tried the typical string.Replace("old","new") but it didn't work.
I tried the below,
cNewLocation ="xyz/files";
cNewString = cLocation.Replce("src='/'", "src='" + cNewLocation + "'/")
It didn't work.
Please suggest.

If I'm understanding what you're asking, you could use Regex to replace the string like so:
var cNewString = Regex.Replace(cLocation, #"src='/.*/", "src='" + newLocation + "/");
EDIT : I modified the regular expression to replace src='/.../ with src='{newLocation}/

you might try looking at the Replace command in c#.
so mystring = srcstring.Replace("old", "New");
http://msdn.microsoft.com/en-us/library/system.string.replace%28v=vs.71%29.aspx
possible replace the / in the string with //?

You can do the following:
string cLocation = "'target='_blank'></a><img alt='testimage.jpg' src='/SPECIMAGE/testimage.jpg'";
cLocation = cLocation.Replace("src='/'", "src='xyz/files'");

This fixes the problem:
int start = cLocation.IndexOf("src='") + 5;
int end = cLocation.LastIndexOf("'");
string xcLocation = cLocation.Remove(start, end - start);
string cLocation = xcLocation.Insert(start , "xyz/files");

How to split the two strings using filetype.split?

I have got a string as follows:
string name ="C:\folder\back-201190082233.zip";
How can I get only the part 201190082233 from the string name? I have tried like this for getting the only the part 201190082233
string filetype = name;
string[] getfiledate = filetype.Split('-');
But I am getting the part 201190082233.zip. Now I want to get only the part 201190082233. Would anyone please help on this?

Seems like a good idea to use regular expressions:
var match = Regex.Match("back.201190082233.zip" , #"(?<=-)\d+(?=\.)");
if(match.Success)
{
var numericPart = match.Value;
}
Edit:
If you're dealing with paths, .Net offers help:
string name = #"C:\folder\back.201190082233.zip";
var fileName = Path.GetFileName(name);
var match = Regex.Match(fileName , #"(?<=-)\d+(?=\.)");
if(match.Success)
{
var numericPart = match.Value;
}

string name = "C:\folder\back-201190082233.zip";
string filetype = name;
string[] getfiledate = filetype.Split(new[] {'.', '-'});
string datepart = getfiledate[1];

How about this way?
var fileDate= filetype.Split('.')[1];
Edit for updates
var fileDate = Path.GetFileNameWithoutExtension(filetype).Split('.')[0]

Probably
var date = Path.GetFileNameWithoutExtension( name ).Split('-')[1];
would be sufficient.
See documentation for function Path.GetFileNameWithoutExtension.

Why are you splitting with a '-' ? Shouldn't it be '.' ?
string numberPart = filetype.Split('.')[1];

You may use something like below
string str = name.Split(".")[1];
Hope this helps!!

or if the string changes you could use a mor specific regular expression like this:
string s = Regex.Replace("back.201190082233.zip", #"[^\.]+\.([^\.]+)\..*", "$1");

Rewrite rule to replace all + with -

My url contains all' + 's like path/My+Property+Details but I need to replace all + with '-'.and make it:
path/My-Property-Details.

Use String.Replace(..), like so:
string s = "path/My+Property+Details";
s = s.Replace("+", "-");
Don't forget the assignment because a string is immutable.

Use String.Replace.
url = url.Replace("+", "-");

Try this:
string newURL = oldUrl.Replace("+", "-");