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Add double quotes to a list to display in a label

Morning folks,
I have an ASP.Net C# page that pulls in a list of servers from a SQL box and displays the list of servers in a label. ("srv1,srv2,srv3"). I need to add double quotes around each of the servers names. ("srv1","srv2","srv3",)
Any help would be greatly appreached.

If you have string
string str = "srv1,srv2,srv3";
Then you can simply do
str = "\"" + str.Replace(",", "\",\"") + "\"";
Now str contains "srv1","srv2","srv3"

As far as I can understand, you are trying to use double quotes in a string.
If you want to use such,
you can use escape character:
("\"srv1\",\"srv2\",\"srv3\"",)
for the sake of simplicity, you can even convert it to a function:
private string quoteString(string serverName){
return "\"" + serverName + "\"";
}
Also, if you have already "srv1,srv2,srv3" format, find ',' characters in the string and add " before and after comma. Also, notice that you should add to first index and last index ".

How to parse a text file and find a string between two other

For example, let's say I have this:
string test = "id:test THISISTHESTRINGIWANT id2:test"
And I want to get THISISTHESTRINGIWANT. In order to do that I was wondering if its possible to find it like this:
left_string = "id:test ", right_string = " id2"
Thank You

You can use the .split like this
string test = "id:test THISISTHESTRINGIWANT id2:test"
char[] delimiterChars = { ' '};
string[] output= test.Split(delimiterChars);
this will give you 3 strings {id:test,THISISTHESTRINGIWANT,id2:test}
you can then iterate through the string array with whatever condition you want to weed out the unwanted data or you can change the char array to include any characters you want to split on.

How to add suffix at each line of large string

I have written a code to add Suffix at end of each line of a multi-line String but code only appends at the end of string. I am beginner. Can somebody help me in clarifying where I am mistaken? Here is my code:
protected void Prefix_Suffix_Btn_Click(object sender, EventArgs e)
{
String txt_input = Input_id.InnerText.ToString().Trim();
String txt_suffix = Suffix_id.InnerText.ToString().Trim();
String txt_output = Output_id.InnerText.ToString().Trim();
txt_input = txt_input.Replace(txt_suffix + "\n", "\n");
txt_input = txt_input + txt_suffix;
Output_id.InnerText = txt_input;
}
Input:
Line1
Line2
Line3
Desired output:
Line1AppededText
Line2AppendedText
Line3AppendedText

Let's Split text to lines, append each line and, finally, Join into string back:
string source = string.Join(Environment.NewLine,
"Line1",
"Line2",
"Line3");
// Let's have a look at the initial string;
Console.WriteLine(source);
Console.WriteLine();
string result = string.Join(Environment.NewLine, source
.Split(new string[] { Environment.NewLine }, StringSplitOptions.None)
.Select(line => line + "AppendedText"));
Console.Write(result);
Outcome:
Line1
Line2
Line3
Line1AppendedText
Line2AppendedText
Line3AppendedText

The string of that comes out of your Input_id.InnerText is a string that consists of many lines. So if you want to append to each line, you need think of a way to treat those lines separately.
A line-end is denoted as the character '\n'. It looks like 2 characters to you, but the engine will treat it as one: line-end.
What you can do is split (break up) this string into multiple strings by snapping the string whenever you find a '\n'. You can do this by the following:
var lines = Input_id.InnerText.ToString().Split('\n');
Now lines contains an array of strings, each item in there containing a line of the input.
Now you could create a new string that will be built up by your split array as follows:
var newString = "";
foreach(var line in lines) {
newString += line + "<appendText>\n"; //note how we add the \n again since those disappeared by splitting
}
Now newString will contain the new string with each line containing the appended text.
A way shorter answer would be to for instance use the replace function like this:
var newString = Input_id.InnerText.ToString().Replace("\n", "<AppendedText>\n");
There is many ways to do what you want.

You just made a mistake when passing your values into the Replace() method. The documentation for String.Replace() defines it like this:
public string Replace (string oldValue, string newValue);
The first argument ("oldValue") should be the thing you want to replace. The second argument ("newValue") should be the thing you want to change it to. You've just got them the wrong way round. You're asking it to replace the new text (suffix and newline) with the old text (just the newline), which clearly it can't do because the suffix text doesn't exist in the string yet - and it wouldn't be logical even if it worked.
Change
txt_input = txt_input.Replace(txt_suffix + "\n", "\n");
to
txt_input = txt_input.Replace("\n", txt_suffix + "\n");
and you should be fine. As other answers alluded to, there may be nicer ways of achieving the same output, but in terms of fixing your original code this is all you should need to do.
Here's a live demo (just using console output instead of HTML elements): https://dotnetfiddle.net/jnzgUy

Incrementer not working inside string replace

I'm attempting to read a line from a file (csv header) and create a column list that prepends "c[num]_" in front of each column with this code:
int colCount=0;
string line = "col1,col2,col3,col4,col5";
string ColumnList = "([" + (++colCount).ToString() + "_" + line.Replace(",", "],[c" + (++colCount).ToString() + "_") + "]";
I know it's not elegant, but I'm also not sure why my colCount variable doesn't increment inside the replace?? It results with a string like:
([c0_col1],[c1_col2],[c1_col3],[c1_col4],[c1_col5])
The counter increments the first time and then not again inside the replace. Any insights? I think it might be better written with a Regex ReplaceEvaluator but I haven't been able to piece that together yet either.

The paramter of the Replace method is string, and the expression you've entered there is just a string. The count will always be 2. It's not a Func, it a string.
You can use the following Linq to easily achieve the conversion you'd like:
string ColumnList = string.Join(",", line.Split(',').Select((s, i) => $"[c{i + 1}_{s}]"));

How to split string variable by multiple characters

I need to split string variable by multiple characters, in my case by " ";
Here is my code:
string s_var = "New String variable";
string[] s_mas = s_var.Split(" ");
The Split() method isn't working for me, it says that the argument " " is invalid.
Hoping you guys know how to solve this issue.

You're not specifying the correct arguments.
If you want to split by a string, you need to specify an array.
You also need to specify whether or not to discard empty strings.
Try this:
var s_mas = s_var.Split(new[] { " " }, StringSplitOptions.None);