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String Manipulation and splitting string

string url = "test:app:https://test#hotmail.co.uk:Test
I need to split this up to display as follows
string first = "app";
string second = "https://test#hotmail.co.uk:Test";
i have tried the following but falls over on the last colon.
string remove= "";
remove= url.Replace("test:", "");
string first= remove.Substring(remove.LastIndexOf(':') + 1);
string second= remove.Substring(0, remove.IndexOf(':'));
Doing this i get
first = "app";
second = "Test";
When i need
first = "app";
second = "https://test#hotmail.co.uk:Test";

Your use of LastIndexOf is just a bit wonky.
string url = "test:app:https://test#hotmail.co.uk:Test";
string remove = url.Replace("test:", "");
string first = remove.Substring(0, remove.IndexOf(":"));
string second = remove.Substring(remove.IndexOf(first) + first.Length + 1);
First grab the app, and we can use the location of app to derive the rest of the string. Because the last index of : would be the one in :Test. We don't want the last index of :. Instead we just want whatever comes after app.

As everything is prefixed with test: you can use a starting position after that and then split after the first occurrance of the : character.
const int IndexOfPrefix = 5; // start position after "test:"
string url = "test:app:https://test#hotmail.co.uk:Test";
var indexOfApp = url.IndexOf(':', IndexOfPrefix);
var part1 = url.Substring(IndexOfPrefix, indexOfApp - IndexOfPrefix);
var part2 = url.Substring(indexOfApp + 1);
Console.WriteLine(part1);
Console.WriteLine(part2);

Something like this should do the trick:
public void ManipulateStrings()
{
string url = "test:app:https://test#hotmail.co.uk:Test";
url = url.Replace("test:", "");
string first = url.Substring(0, url.IndexOf(':'));
string second = url.Substring(url.IndexOf(':') + 1);
}
This basically removed test: from your string, then assigns first and second their values without creating string remove = "" for no reason.

You can use Split(Char[], Int32) to get the desired number of elements (3 : the first unwanted part, the first expected part and the remaining) along with Skip() to remove the unwanted one :
string url = "test:app:https://test#hotmail.co.uk:Test";
var splitted = url.Split(new [] { ':' }, 3).Skip(1).ToArray();
var first = splitted[0];
var second = splitted[1];
Console.WriteLine(first);
Console.WriteLine(second);
This outputs
app
https://test#hotmail.co.uk:Test
Another way to do that is using regular expressions :
The pattern :(?<first>.*?):(?<second>.*) will :
: search for the characters :
(?<first>.*?) creates a group named first that will match any number of any character (lazy)
: search for the characters :
(?<second>.*) creates a group named second that will match any number of any character (greedy)
In example :
string url = "test:app:https://test#hotmail.co.uk:Test";
var pattern = ":(?<first>.*?):(?<second>.*)";
var regex = new Regex(pattern); // using System.Text.RegularExpressions;
Match match = regex.Match(url);
if (match.Success)
{
var first = match.Groups["first"].Value;
var second = match.Groups["second"].Value;
Console.WriteLine(first);
Console.WriteLine(second);
}
This outputs
app
https://test#hotmail.co.uk:Test

you need to change the variable with name "first" to "second" and to change the variable with name "second" to "first"
This is your code:
string url = "test:app:https://test#hotmail.co.uk:Test";
string remove = "";
remove = url.Replace("test:", "");
string second = remove.Substring(0, remove.IndexOf(':'));
string first = remove.Substring(remove.IndexOf(":") + 1);
and this is the correct code:
string url = "test:app:https://test#hotmail.co.uk:Test";
string remove = "";
remove = url.Replace("test:", "");
string first = remove.Substring(0, remove.IndexOf(':'));
string second = remove.Substring(remove.IndexOf(":") + 1);

C# extract data from csv

I have a CSV file like this:
field1,field2,field3,field4,...,fieldN
1,2,3,,...,N
and I want to extract exactly the 14th record of the second row.
I've tried this code:
string nomeFile = "externalSourceMsg " + this.DataSource.CodSorgEst + this.DataSource.CodIdSorgEst + ".csv";
string content = "Field1,Field2,Field3,Field4,Field5,Field6,Field7" + Environment.NewLine;
content += externalMessage.ToString();
content = content.Replace(',', ';');
int i = 0;
while (content){
int field;
if(i++ == 13)
field = content+i;
}
but it doesn't work. What did I do wrong?

Split the string and you can access fields by indexes.
string nomeFile = "externalSourceMsg " + this.DataSource.CodSorgEst + this.DataSource.CodIdSorgEst + ".csv";
string content = "Field1,Field2,Field3,Field4,Field5,Field6,Field7" + Environment.NewLine;
content += externalMessage.ToString();
content = content.Replace(',', ';');
// Split the string by your separator -> you will get an array filled with fields
string[] contentArr = content.Split(';');
// Access any field you'd like by indexes
var The14thField = contentArr[13];

Try:
// Read all lines and get the second (this can be done
// in more optimal way, just by reading two first lines)
var secondLine = File.ReadLines("Path")[1];
// Split byb comma and get 14th item in returned array
var entry = secondLine.Split(",")[13];

extract numerical values from string after dash (-)

I have string value like this Rs.100 - Rs.250 Now I want only 250 from this string.
I tried this but it's not getting output
var result = str.Substring(str.LastIndexOf('-') + 1);
UPDATE
string result = price.Text;
string[] final_result = result.Split('.');
dynamic get_result = final_result(1).ToString();
price.Text = final_result.ToString;

Try this code after getting the result of Rs.250.
var data = Regex.Match(result, #"\d+").Value;

Do it like this:
string str = "Rs.100-Rs.250";
var result = str.Substring(str.LastIndexOf('-') + 1);
String[] final_result = result.Split('.');
var get_result = final_result[1].ToString();
this will get 250 as you wanted.

try this
var result = ("Rs.100 - Rs.250").Split('-').LastOrDefault().Split('.').LastOrDefault();

dynamic substring in c#

I have a set of code in c# I want to store into the database what the user is entering in the textbox.
The user enters into the textbox like this
input namexyzpan9837663placeofbirthmumbailocationwadala
This is what user enters
(name: xyz pan: 9837663 place of birth: mumbai location: wadala)
Output into the database
xyz 9837663 mumbai wadala
OR
name xyzapan72placeofbirthgoalocationpanji
(> name: xyza pan: 72 place of birth: goa location: panji)
Output into the database
xyza 72 goa panji
name, age, location and placeofbirth are static but the value inside
them are dynamic
I know substring is helpfull but i don't know how to use it.

Use can use Split if the keywords are static :
string strMain = "namexyzpan9837663placeofbirthmumbailocationwadala";
var results = strMain.Split(new string[] { "name", "pan", "placeofbirth", "location" }, StringSplitOptions.RemoveEmptyEntries);
string name = results[0];
string pan = results[1];
string location = results[2];
You said you didn't know how to use Substring, well here it is working:
Note that the second parameter for this method is the length of the string to be taken and not the index at which to stop.
string strMain = "namexyzpan9837663placeofbirthmumbailocationwadala";
int indexOfName = strMain.IndexOf("name");
int indexOfPan = strMain.IndexOf("pan");
int indexOfBirth = strMain.IndexOf("placeofbirth");
int indexOflocation = strMain.IndexOf("location");
int effectiveIndexOfName = indexOfName + "name".Length;
int effectiveIndexOfPan = indexOfPan + "pan".Length;
int effectiveIndexOfBirth = indexOfBirth + "placeofbirth".Length;
int effectiveIndexOflocation = indexOflocation + "location".Length;
string name1 = strMain.Substring(effectiveIndexOfName, indexOfPan- effectiveIndexOfName);
string pan1 = strMain.Substring(effectiveIndexOfPan, indexOfBirth - effectiveIndexOfPan);
string birth1 = strMain.Substring(effectiveIndexOfBirth, indexOflocation - effectiveIndexOfBirth);
string location1 = strMain.Substring(effectiveIndexOflocation);
namenamepan9837663placeofbirthmumbailocationwadala works using the second method. But namepanpan9837663placeofbirthmumbailocationwadala is an interesting case that definitely needs a workaround.

Regex is designed for such case.
var input = #"namexyzpan9837663placeofbirthmumbailocationwadala";
var match = Regex.Match(input, #"^\s*"
+ #"name\s*(?<name>\w+?)\s*"
+ #"pan\s*(?<pan>\w+?)\s*"
+ #"placeofbirth\s*(?<placeOfBirth>\w+?)\s*"
+ #"location\s*(?<location>\w+)\s*" + #"$");
var name = match.Groups["name"].Value;
var pan = match.Groups["pan"].Value;
var placeOfBirth = match.Groups["placeOfBirth"].Value;
var location = match.Groups["location"].Value;

Want to assign HTML value to String variable

I want to assign HTML snippet to string variable.
something like -
string div = "<table><tr><td>Hello</td></tr></table>"; // It should return only 'Hello'
Please suggest.

string div = "<table><tr><td>Hello</td></tr></table>"; // It should return only 'Hello
var doc = new XmlDocument();
doc.LoadXml(div);
string text = doc.InnerText;
Do you also need the Jquery version of this?

If you are sure that the HTML won't change between the string you want to get, you can simply do a Substring between the two constants string and you will get your string into your variable.
const string prefix = "<table>";
const string suffix = "</table>";
string s = prefix + "TEST" + suffix ;
string s2 = s.Substring(prefix.Length, s.IndexOf(suffix, StringComparison.Ordinal) - prefix.Length);
Here is the Regex version:
const string prefix = "<table>";
const string suffix = "</table>";
string s = prefix + "TEST" + suffix;
string s2 = Regex.Match(s, prefix + "(.*)" + suffix).Groups[1].Value;