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how i can get the string after specific character in my case :?

str="Brand : TROLLBEADS";
int length = str.Length;
length = length - 6;
str = str.Substring(6, length);
i want to display "TROLLBEADS"
and want to discard other remaining string

You can split the string using : delimiter if it is fixed
var result = str.Split(':')[1].Trim();
or if your string can have multiple : in that case
var result = str.Substring(str.IndexOf(":") + 1).Trim();

Split is nice, but a bit too much. You can just specify the start position for substring.
string str="Brand : TROLLBEADS";
string val = str.Substring(str.IndexOf(":") + 1);
Console.WriteLine(val);

C# Getting the text between 2 characters in a string

public String GetDirectory(String Path)
{
Console.WriteLine("Directorul: ");
var start = Path.IndexOf(":") + 6;
var match2 = Path.Substring(start, Path.IndexOf(".") - start);
return Path;
}
I need to get the path string between the 2 characters in this string:
"C:\Documents\Text.txt"
I want it to show the text between ':' and '.' at the end so :"\Documents\Text"

int start_index = Path.IndexOf(':')+1;
int end_index = Path.LastIndexOf('.');
int length = end_index-start_index;
string directory = Path.Substring(start_index,length);

Linq is always fascinating:
string s = string.Join("",
Path.SkipWhile(p => p != ':')
.Skip(1)
.TakeWhile(p => p != '.')
);

You can use string operations, but you can also use the System.IO.Path functions for a - in my personal opinion - more elegant solution:
string path = #"C:\Documents\Text.txt";
string pathRoot = Path.GetPathRoot(path); // pathRoot will be "C:\", for example
string result = Path.GetDirectoryName(path).Substring(pathRoot.Length - 1) +
Path.DirectorySeparatorChar +
Path.GetFileNameWithoutExtension(path);
Console.WriteLine(result);

you should return your match2 instead of the path since path will remain C:\Documents\Text.txt
public String GetDirectory(String Path)
{
Console.WriteLine("Directorul: ");
var start = Path.IndexOf(":") + 6;
var match2 = Path.Substring(start, Path.IndexOf(".") - start);
return match2;
}

patch = patch.Substring(patch.IndexOf(':') + 1, patch.IndexOf('.') - 2);

Get all instances of sub-string one at a time?

If i have a string containing three 0 values, how would i grab them one by one in order to replace them?
the 0's could be located anywhere in the string.
i don't want to use regex.
example string to parse:
String myString = "hello 0 goodbye 0 clowns are cool 0";
right now i can only find the three 0 values if they are right next to each other. i replace them using stringToParse.Replace("0", "whatever value i want to replace it with");
I want to be able to replace each instance of 0 with a different value...

You can do something like this:
var strings = myString.Split('0');
var replaced = new StringBuilder(strings[0]);
for (var i = 1; i < strings.Length; ++i)
{
replaced.Append("REPLACED " + i.ToString());
replaced.Append(strings[i]);
}

pseudolang :
s = "yes 0 ok 0 and 0"
arr = s.split(" 0")
newstring = arr[0] + replace1 + arr[1] + replace2 + arr[2] + replace3

If you have control of these input strings, then I would use a composite format string instead:
string myString = "hello {0} goodbye {1} clowns are cool {2}";
string replaced = string.Format(myString, "replace0", "replace1", "replace2");

public string ReplaceOne(string full, string match, string replace)
{
int firstMatch = full.indexOf(match);
if(firstMatch < 0)
{
return full;
}
string left;
string right;
if(firstMatch == 0)
left = "";
else
left = full.substring(0,firstMatch);
if(firstMatch + match.length >= full.length)
right = "";
else
right = full.substring(firstMatch+match.length);
return left + replace + right
}
If your match can occur in replace, then you will want to track what index your upto and pass it in to indexOf.

Using LINQ and generic function to decouple replacement logic.
var replace = (index) => {
// put any custom logic here
return (char) index;
};
string input = "hello 0 goodbye 0 clowns are cool 0";
string output = new string(input.Select((c, i) => c == '0' ? replace(i) : c)
.ToArray());
Pros:
Char replacement logic decoupled from the string processing (actually LINQ query)
Cons:
Not the best solution from performance perspectives

Adding a '-' to my string in C#

I Have a string in the form "123456789".
While displaying it on the screen I want to show it as 123-456-789.
Please let me knwo how to add the "-" for every 3 numbers.
Thanks in Advance.

You can use string.Substring:
s = s.Substring(0, 3) + "-" + s.Substring(3, 3) + "-" + s.Substring(6, 3);
or a regular expression (ideone):
s = Regex.Replace(s, #"\d{3}(?=\d)", "$0-");

I'll go ahead and give the Regex based solution:
string rawNumber = "123456789";
var formattedNumber = Regex.Replace(rawNumber, #"(\d{3}(?!$))", "$1-");
That regex breaks down as follows:
( // Group the whole pattern so we can get its value in the call to Regex.Replace()
\d // This is a digit
{3} // match the previous pattern 3 times
(?!$) // This weird looking thing means "match anywhere EXCEPT the end of the string"
)
The "$1-" replacement string means that whenever a match for the above pattern is found, replace it with the same thing (the $1 part), followed by a -. So in "123456789", it would match 123 and 456, but not 789 because it's at the end of the string. It then replaces them with 123- and 456-, giving the final result 123-456-789.

You can use for loop also if the string length is not fixed to 9 digits as follows
string textnumber = "123456789"; // textnumber = "123456789012346" also it will work
string finaltext = textnumber[0]+ "";
for (int i = 1; i < textnumber.Length; i++)
{
if ((i + 1) % 3 == 0)
{
finaltext = finaltext + textnumber[i] + "-";
}
else
{
finaltext = finaltext + textnumber[i];
}
}
finaltext = finaltext.Remove(finaltext.Length - 1);

How do I extract text that lies between parentheses (round brackets)?

I have a string User name (sales) and I want to extract the text between the brackets, how would I do this?
I suspect sub-string but I can't work out how to read until the closing bracket, the length of text will vary.

If you wish to stay away from regular expressions, the simplest way I can think of is:
string input = "User name (sales)";
string output = input.Split('(', ')')[1];

A very simple way to do it is by using regular expressions:
Regex.Match("User name (sales)", #"\(([^)]*)\)").Groups[1].Value
As a response to the (very funny) comment, here's the same Regex with some explanation:
\( # Escaped parenthesis, means "starts with a '(' character"
( # Parentheses in a regex mean "put (capture) the stuff
# in between into the Groups array"
[^)] # Any character that is not a ')' character
* # Zero or more occurrences of the aforementioned "non ')' char"
) # Close the capturing group
\) # "Ends with a ')' character"

Assuming that you only have one pair of parenthesis.
string s = "User name (sales)";
int start = s.IndexOf("(") + 1;
int end = s.IndexOf(")", start);
string result = s.Substring(start, end - start);

Use this function:
public string GetSubstringByString(string a, string b, string c)
{
return c.Substring((c.IndexOf(a) + a.Length), (c.IndexOf(b) - c.IndexOf(a) - a.Length));
}
and here is the usage:
GetSubstringByString("(", ")", "User name (sales)")
and the output would be:
sales

Regular expressions might be the best tool here. If you are not famililar with them, I recommend you install Expresso - a great little regex tool.
Something like:
Regex regex = new Regex("\\((?<TextInsideBrackets>\\w+)\\)");
string incomingValue = "Username (sales)";
string insideBrackets = null;
Match match = regex.Match(incomingValue);
if(match.Success)
{
insideBrackets = match.Groups["TextInsideBrackets"].Value;
}

string input = "User name (sales)";
string output = input.Substring(input.IndexOf('(') + 1, input.IndexOf(')') - input.IndexOf('(') - 1);

A regex maybe? I think this would work...
\(([a-z]+?)\)

using System;
using System.Text.RegularExpressions;
private IEnumerable<string> GetSubStrings(string input, string start, string end)
{
Regex r = new Regex(Regex.Escape(start) +`"(.*?)"` + Regex.Escape(end));
MatchCollection matches = r.Matches(input);
foreach (Match match in matches)
yield return match.Groups[1].Value;
}

int start = input.IndexOf("(") + 1;
int length = input.IndexOf(")") - start;
output = input.Substring(start, length);

Use a Regular Expression:
string test = "(test)";
string word = Regex.Match(test, #"\((\w+)\)").Groups[1].Value;
Console.WriteLine(word);

input.Remove(input.IndexOf(')')).Substring(input.IndexOf('(') + 1);

The regex method is superior I think, but if you wanted to use the humble substring
string input= "my name is (Jayne C)";
int start = input.IndexOf("(");
int stop = input.IndexOf(")");
string output = input.Substring(start+1, stop - start - 1);
or
string input = "my name is (Jayne C)";
string output = input.Substring(input.IndexOf("(") +1, input.IndexOf(")")- input.IndexOf("(")- 1);

var input = "12(34)1(12)(14)234";
var output = "";
for (int i = 0; i < input.Length; i++)
{
if (input[i] == '(')
{
var start = i + 1;
var end = input.IndexOf(')', i + 1);
output += input.Substring(start, end - start) + ",";
}
}
if (output.Length > 0) // remove last comma
output = output.Remove(output.Length - 1);
output : "34,12,14"

Here is a general purpose readable function that avoids using regex:
// Returns the text between 'start' and 'end'.
string ExtractBetween(string text, string start, string end)
{
int iStart = text.IndexOf(start);
iStart = (iStart == -1) ? 0 : iStart + start.Length;
int iEnd = text.LastIndexOf(end);
if(iEnd == -1)
{
iEnd = text.Length;
}
int len = iEnd - iStart;
return text.Substring(iStart, len);
}
To call it in your particular example you can do:
string result = ExtractBetween("User name (sales)", "(", ")");

I'm finding that regular expressions are extremely useful but very difficult to write. So, I did some research and found this tool that makes writing them so easy.
Don't shy away from them because the syntax is difficult to figure out. They can be so powerful.

This code is faster than most solutions here (if not all), packed as String extension method, it does not support recursive nesting:
public static string GetNestedString(this string str, char start, char end)
{
int s = -1;
int i = -1;
while (++i < str.Length)
if (str[i] == start)
{
s = i;
break;
}
int e = -1;
while(++i < str.Length)
if (str[i] == end)
{
e = i;
break;
}
if (e > s)
return str.Substring(s + 1, e - s - 1);
return null;
}
This one is little longer and slower, but it handles recursive nesting more nicely:
public static string GetNestedString(this string str, char start, char end)
{
int s = -1;
int i = -1;
while (++i < str.Length)
if (str[i] == start)
{
s = i;
break;
}
int e = -1;
int depth = 0;
while (++i < str.Length)
if (str[i] == end)
{
e = i;
if (depth == 0)
break;
else
--depth;
}
else if (str[i] == start)
++depth;
if (e > s)
return str.Substring(s + 1, e - s - 1);
return null;
}

I've been using and abusing C#9 recently and I can't help throwing in Spans even in questionable scenarios... Just for the fun of it, here's a variation on the answers above:
var input = "User name (sales)";
var txtSpan = input.AsSpan();
var startPoint = txtSpan.IndexOf('(') + 1;
var length = txtSpan.LastIndexOf(')') - startPoint;
var output = txtSpan.Slice(startPoint, length);
For the OP's specific scenario, it produces the right output.
(Personally, I'd use RegEx, as posted by others. It's easier to get around the more tricky scenarios where the solution above falls apart).
A better version (as extension method) I made for my own project:
//Note: This only captures the first occurrence, but
//can be easily modified to scan across the text (I'd prefer Slicing a Span)
public static string ExtractFromBetweenChars(this string txt, char openChar, char closeChar)
{
ReadOnlySpan<char> span = txt.AsSpan();
int firstCharPos = span.IndexOf(openChar);
int lastCharPos = -1;
if (firstCharPos != -1)
{
for (int n = firstCharPos + 1; n < span.Length; n++)
{
if (span[n] == openChar) firstCharPos = n; //This allows the opening char position to change
if (span[n] == closeChar) lastCharPos = n;
if (lastCharPos > firstCharPos) break;
//This would correctly extract "sales" from this [contrived]
//example: "just (a (name (sales) )))(test"
}
return span.Slice(firstCharPos + 1, lastCharPos - firstCharPos - 1).ToString();
}
return "";
}

Much similar to #Gustavo Baiocchi Costa but offset is being calculated with another intermediate Substring.
int innerTextStart = input.IndexOf("(") + 1;
int innerTextLength = input.Substring(start).IndexOf(")");
string output = input.Substring(innerTextStart, innerTextLength);

I came across this while I was looking for a solution to a very similar implementation.
Here is a snippet from my actual code. Starts substring from the first char (index 0).
string separator = "\n"; //line terminator
string output;
string input= "HowAreYou?\nLets go there!";
output = input.Substring(0, input.IndexOf(separator));