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How to remove duplicates from a string? [closed]

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The code is supposed to put all letters into lower case and change j to i, which it does. But I'm trying to take out any duplicate letters.
example inputted string = jjjaaaMMM expected output string = jam
what actually happens real output string = m please help I'm not sure what I'm missing.
string key = Secret.Text;
var keyLow = key.ToLower();
var newKey = keyLow.Replace("j", "i");
var set = new HashSet<char>(newKey);
foreach (char c in set)
{
Secret.Text = Char.ToString(c);
}

Your issue is entirely the = in
Secret.Text = Char.ToString(c);
it needs to be +=
Secret.Text += Char.ToString(c);
You were overwriting each value with the next.
However you could just use linq
Secret.Text = string.Concat(key.ToLower().Replace("j", "i").Distinct());
or probably more efficiently from #Ben Voigt comments
Since you have a sequence of char, it's probably more efficient to
call the string constructor than Concat
Secret.Text = new string(set.ToArray());
// or
Secret.Text = new string(key.ToLower()
.Replace("j", "i")
.Distinct()
.ToArray());
Additional Resources
String.Concat Method
Concatenates one or more instances of String, or the String
representations of the values of one or more instances of Object.
Enumerable.Distinct Method
Returns distinct elements from a sequence.

Others may answer the question directly. I'll provide an alternative. As always with string manipulation, there's a Regex for that.
var output = Regex.Replace(input, #"(.)\1*", "$1");

You can use Linq approach:
var text = key.ToLower().Distinct().ToArray();
Don't forgot add using System.Linq

How do I split a string with '$' delimiter? [closed]

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I have this FINAL PAYMENT $25 string on a MVC c# application.
I want to split into FINAL PAYMENT and 25
I tried doing this
string s = "FINAL PAYMENT $25";
string[] str1 = s.Split('$');
//result: 25
How can I get the rest. Can anyone help?

Split method returns a string array, if you need both elements of this array, Try:
string s = "FINAL PAYMENT $25";
string[] resArray = s.Split('$');
var FPayment = resArray[0];
var second25= resArray[1];

You can use indexOf instead of a Split
string s = "FINAL PAYMENT $25";
int index = s.IndexOf("$");
String final_pay = s.Substring(index + 1);

How to extract string between same char [closed]

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I have a string "ABD-DDD-RED-Large" and need to extract "DDD-RED"
using the Split I have:
var split = "ABD-DDD-RED-Large".Split('-');
var first = split[0];
var second = split[1];
var third = split[2];
var fourth = split[3];
string value = string.Join("-", second, third);
just wondering if there's a shorter code

If you just want the second and third parts of an always 4 part (delimited by -) string you can one line it with LINQ:
string value = string.Join("-", someInputString.Split('-').Skip(1).Take(2));
An input of: "ABD-DDD-RED-Large" would give you an output of: "DDD-RED"

Not enough information. You mentioned that string is not static. May be Regex?
string input = "ABD-DDD-RED-Large";
string pattern = #"(?i)^[a-z]+-([a-z]+-[a-z]+)";
string s = Regex.Match(input, pattern).Groups[1].Value;

Use regex
var match = Regex.Match(split, #".*?-(.*?-.*?)-.*?");
var value = match.Success ? match.Groups[1].Value : string.Empty;

I'm going out on a limb and assuming your string is always FOUR substrings divided by THREE hyphens. The main benefit of doing it this way is that it only requires the basic String library.
You can use:
int firstDelIndex = input.IndexOf('-');
int lastDelIndex = input.LastIndexOf('-');
int neededLength = lastDelIndex - firstDelIndex - 1;
result = input.Substring((firstDelIndex + 1), neededLength);
This is generic enough to not care what any of the actual inputs are except the hyphen character.
You may want to add a catch at the start of the method using this to ensure there are at least two hyphen's in the input string before trying to pull out the requested substring.

How can I extract sub-string from string in c# code? [closed]

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How can I extract this sub-string "60684" from this string "/fa/Viewer/Switcher/60684/0" in c#?

You can use Split method :
string str = "/fa/12012/Switcher/60684/0";
string str2 = str.Split('/')[4];

One way is to use regex:
static void Main()
{
string pattern = #"\/[a-zA-Z]+\/[a-zA-Z]+\/[a-zA-Z]+\/([0-9]+)\/[a-z0-9]+";
var regex = new Regex(pattern);
string path = "/fa/Viewer/Switcher/60684/0";
var match = regex.Match(path);
Console.WriteLine(match.Groups[1].ToString());
}

Like this:
string url = #"/fa/12012/Switcher/60684/0";
string[] NumberAfterSwitcher = url.Split('/');
string num = (NumberAfterSwitcher.Length > 3) ? (String)url.Split('/').GetValue(3) : String.Empty;

Extract the first two words from a string with C# [closed]

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I guys im trying to workout C# code to extract the first two words from string. below is code im doing.
public static string GetDetailsAsString(string Details)
{
string Items = //how to get first 2 word from string???
if (Items == null || Items.Length == 0)
return string.Empty;
else
return Items;
}

Define "words", if you want to get the first two words that are separated by white-spaces you can use String.Split and Enumerable.Take:
string[] words = Details.Split();
var twoWords = words.Take(2);
If you want them as separate string:
string firstWords = twoWords.First();
string secondWord = twoWords.Last();
If you want the first two words as single string you can use String.Join:
string twoWordsTogether = string.Join(" ", twoWords);
Note that this simple approach will replace new-line/tab characters with empty spaces.

Assuming the words are separated by whitespaces:
var WordsArray=Details.Split();
string Items = WordsArray[0] + ' ' + WordsArray[1];