How To Count Number Of Occurrences In A Text String

Oct 15, 2009

I'm new to visual basic 2008 (Trying to write desktop apps for work) and would like to know how to count the number of occurrences of a character or substring in a string.

I know how test test if the character is there, but can't find any documentation on how to count them if there's more than 1.

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Group List And Get A Count Of The Number Of Occurrences Sorted Descending

Feb 8, 2011

I have a list of ids properly stored in a List<>. I now need to Group list and get a count of the number of occurrences sorted descending.


List<string> aryIDs = new List<string>;

Would Produce:

"1234", 3
"4321", 2
"3214", 1

This would be easy in TSQL, but I would like to avoid the server roundtrip, unnecessary tables, etc. if possible.

Update: The VB.NET conversion for Ralph Shillington's answer below:


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Find # Of Occurrences & Count In String Using Collections / Generics?

Mar 4, 2010

I tried so much working with this to get distinct Words and their count. I'm using ASP.NET 2.0. And i also googled so much.

1)Ex(String): The DOTNET is Very Cool! The Best.

2) Capture all the sequences like Space, FullStop, Question Mark, Exclamation, Apostrophe, New Line....(May be with RegEx?)

3)Split Words According to the above sequences

4)Get Distinct Words(Occurences) and their count based on the input string in 1st statement.

Desired O/P:
The - 2
Is - 1
Very - 1
Cool - 1
Best - 1

This is my Sample Code for your Ref.


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SQL Server :: Count Occurrences In Bridge Table?

Nov 22, 2010

Im looking for a sql solution for counting records in a bridge table. I want to select all in table1 and add a column with count of each author's titles. Ive tried

SELCET Table1(*), COUNT(DISTINCT table.au_id) AS Titles

but keep getting an error.

The tables I have are as follows:


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Dec 15, 2010

i have a gridview and i want all occurences of a particular string inside the gridview to be replaced with another string.

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Aug 25, 2009

I am trying to convert a part of an html markup of a certain web page to XmlDocument. So far I've made a string that has opening and corresponding closing tags however my result contains tags like this:

<table border=0 background="" cellpadding="0" bgcolor=white>

Because of the border=0 instead of double quotes after the '=' sign I can't convert it to XmlDocument.

How can I replace occurences of attribute=text to attribute="text" of my string?

P.S. I'm using WebRequest and WebResponse to get the html code of the page.

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Dec 17, 2010

When a user submits the query to SQL when clicking a button I need to get a count of the number of rows that are returned. Which event does the gridview.count code need to be place in?

Right now I have it in the btn_click event, but in order to get it to count the rows you have to hit the button twice since the query is not returned yet. Here is my code.


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C# - Counting Occurrences Of A String In An Array And Then Removing Duplicates?

Jan 2, 2010

I am fairly new to C# programming and I am stuck on my little ASP.NET project.

My website currently examines Twitter statuses for URLs and then adds those URLs to an array, all via a regular expression pattern matching procedure. Clearly more than one person will update a with a specific URL so I do not want to list duplicates, and I want to count the number of times a particular URL is mentioned in, say, 100 tweets.

Now I have a List<String> which I can sort so that all duplicate URLs are next to each other. I was under the impression that I could compare list[i] with list[i+1] and if they match, for a counter to be added to (count++), and if they don't match, then for the URL and the count value to be added to a new array, assuming that this is the end of the duplicates.

This would remove duplicates and give me a count of the number of occurrences for each URL. At the moment, what I have is not working, and I do not know why (like I say, I am not very experienced with it all).

With the code below, assume that a JSON feed has been searched for using a keyword into srchResponse.results. The results with URLs in them get added to sList, a string List type, which contains only the URLs, not the message as a whole.

I want to put one of each URL (no duplicates), a count integer (to string) for the number of occurrences of a URL, and the username, message, and user image URL all into my jagged array called 'urls[100][]'. I have made the array 100 rows long to make sure everything can fit but generally, this is too big. Each 'row' will have 5 elements in them.

The debugger gets stuck on the line: if (sList[i] == sList[i + 1]) which is the crux of my idea, so clearly the logic is not working.

Here is sample code:

var sList = new ArrayList();
string[][] urls = new string[100][];
int ctr = 0;
int j = 1;
foreach (Result res in srchResponse.results)
string content = res.text;
string pattern = @"((https?|ftp|gopher|telnet|file|notes|ms-help):((//)|(\\))+[wd:#@%/;$()~_?+-=\.&]*)";
MatchCollection matches = Regex.Matches(content, pattern);
foreach (Match match in matches)
GroupCollection groups = match.Groups;
foreach (Result res in srchResponse.results)
for (int i = 0; i < 100; i++)
if (sList[i] == sList[i + 1])
urls[ctr][0] = sList[i].ToString();
urls[ctr][1] = j.ToString();
urls[ctr][2] = res.text;
urls[ctr][3] = res.from_user;
urls[ctr][4] = res.profile_image_url;
j = 1;

The code then goes on to add each result into a StringBuilder method with the HTML.Is now edite

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Regex Replace Replaces Multiple Occurrences Inside The Text?

Jun 18, 2009

I have a program which should add a special tag at the end of each hyperlink tag in an HTML file. So, I read the file into a variable, then I have a regex to match the hyperlinks:

string httpString = "href="http://[^\x23\d].*"";

Then, I want to say for every hyperlink in the collection put at the end CT + an increasing number, so the links at the end would be:

<a href="" CT1>
<a href="" CT2>
<a href="" CT3> and so on.

The problem is when two links are identical i.e. when there is a hyperlink in the HTML and an image next to it, both pointing at the same URL. That's where the find and replace regex matches don't do what I want. I need in each link a sepearate CTn label:


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Mar 22, 2009

i have created a website, i want to find out the daily hits,how do i implement it.. can it be done using Application object

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Feb 23, 2009

I have three access data sources where I use select count statements on all of them so that I can get the number of records from each of the data sources based on certain criteria a date to & from, and a couple of drop downs. That part all works fine but I want to take the counts that I get from each of the data sources and do Math with them and display the output of the math on the same page as the output of the data sources.

Here is an example of one of the count statements.


Here is the code where I have the data produced from the command printed to the screen


If there is anything else that you need please let me know also if this is not the right way I should be doing this feel free to let me know as well.

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May 25, 2010

I have stored resumes in my database and i have retrive it from web page by creating linkbutton...i can view ,download the resumes which i stored in my database.My issuse is when i view one resume example (domnic resume)then no of visitor for domnic resume should be count .if again i view that resume no of visitor should be can i do that in

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Sep 27, 2010

im hope i can make sense to this post cause i dont have an idea where to begin :-) I have some files upload code so the user can upload files to the server (it can be 1 or 5 or 20 files). the code is working fine, and the files uploading to the folder on the server. The problem is, that after the files uploads i need to display to the user some textboxes to every file (like: number of copies, if its color or b/w, the print size etc). is there some way, after the files is uploaded, to show the user the name of the files and for each file name to display some textboxes (like: to count the number of files and then display the names and few same textboxes for each file),

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Web Forms :: How To Display Number Of Count Of Row From Db

Jan 8, 2010

i am using sql 2005 db and visualstudio 2005. i have created a table called attendance where i store employee attendance, i want to separate number of absence for a particular employee and particular month. It have to show number of absence of a particular employee and particular month. Also i have to count no of absence.for eg: if an employee absence for two days for a particular month, it have to display2 count.. how to do this? also how to write the store procedure for this? I have to display the number of count from db to form..I have display the number of absence from db to form using label or text box.. please forward some coding regarding this..

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May 25, 2009

if I declared

protected void Button1_Click(object sender, EventArgs e)

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Dec 9, 2010

How to count the total no. of checkboxes, checkboxes checked, no. of checkboxes remain unchecked in webform using ?

I m using Visual studio 2008 with vb as a language ..

I my webform i have 10 checkboxes...

i wanna count total no. of checkboxes in webform in textboxes1

total no. of checkboxes checked in webform in textbox2

total no. of checkboxes remain unchecked in webform in textbox3

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Nov 18, 2009

How to count the number of visitors of a webpage using javascript? How it is possible?

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Sep 18, 2010

On my current form I have it validating a Canadian Postal Address (xxx xxx). The space is optional but if the user does not use a space, then once the validation passes it will insert one. How can I count the first 3 characters of the textbox, insert a space, then add the rest of the characters?

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Nov 6, 2008

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Aug 1, 2010

I have got the total number of registered user's and the total number of users online working without any problems after a search on here.


but I would like to expand this a little. Can any one tell me how I would display the total number of users who are approved and the total number who are locked out.

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Feb 3, 2010

I want to count the number of rows in Gridview ,thru JS. When SelectAll is executed,alert message 'a' is displayed,then page posts back to the server.1) It do not display the alert message gridLength 2)WHy the page is postbacked,I write return false???

function SelectAll()
var gvET='<%=GrdCostPetroleum.ClientID%>';
var gridLength = gvET.rows.length;
alert (gridLength );
return false ;

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Sep 1, 2010

Using Microsoft built-in jquery files, when counting numbers of checked checkbox, the jquery-1.4.2.min.js cannot count the correct result ,however, the version jquery-1.3.2.min.js gives out the correct one, why?

$("#check").click(function () {
var nameSports = new Array();
var i = 0;
$('input[name=selector]:checked').each(function () {
nameSports[i] = jQuery(this).val();
i += 1;
if (loopCounter != 0) {
<input type="checkbox" value="1" name="selector">
<input type="checkbox" value="2" name="selector">
<input type="checkbox" value="3" name="selector">
<a id="check">Check Items</a>

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Nov 2, 2010

I have a label lblCountCharacter with text "4000" and a textbox txtAddNote where users can enter text.

On entering one character in txtAddNote, the label text is decreased by one.

write a function for this in using C#.

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May 3, 2010

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Points to be considered:

1) Simplest way would be to use Application or Cache object to have the counts on Session start or end. However this would fail if there is a worker process recycle. Wouldn't it?

2) Should't make a difference whether the session is inproc/state server managed/ or SQL server managed.

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Is there any way to count the number of stored procedures in specific database?

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I have a website that has 10 aspx pages in it, and I'm trying to count how many users are on any one page at a time, and display that number on the web page. I have set it up to use an Application object ("TotalViewers"), and initialize it to 0 in the Application_Start event handler of the global.asax file. My reasoning (probably way off base) is to increment the count on each page load, and then decrement the count on each page unload. The increment part works ok, but when I add the code in the page unload event handler to decrement, it seems that Unload happens before the Page is presented to the client, so the value always stays the same (adds one in page load, subtracts one in page unload).

How else can I track number of users on each page? (simply, becuase I am still a beginner). I have already done some google searching and haven't come up with anything useful.

All my pages are being navigated via a TreeView control.

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