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Posted 15 Oct 2010

Live Chat - Template Code

, 18 Oct 2010
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How to create a web Live Chat via C# ASP.NET + jQuery/AJAX


I was looking around for some code for a Live Chat feature for a .NET application. (The kind where you can talk with a technician at a company, not an instant messenger). I didn't see anything, so I wrote some base code to do it here.


This uses jQuery & Ajax calls. Also uses the for encoding strings into json.
Performance hit: It just polls the server for messages (because it's not a client-app).
Also: There's a bunch of dummy code in there that would be replaced with connections to a database. I'm currently using the Session.ClientLCID to uniquely identify a session. If you had users logging in, you'd replace that with user Ids.

(Not enough commenting in code. I will try to improve this, but since I'm not sure anybody will look at this....... I may just let you figure it out yourself.)

What does the Code Look Like?

So, the HTML is pretty simple.

<input type="hidden" id="LastUpdateId" value="0" />
<input type="hidden" id="ConversationId" value="0" />
<div id="result"></div>
<textarea id="message"></textarea>
<input type="button" id="send" value="send" />

The C# isn't too bad either:

public static IEnumerable<IMailUpdate> 
	GetUpdates(int ConversationId, int LastUpdateId) {
    Conversation c = DAC.GetConversation(ConversationId);
    return c.GetUpdatesAfter(LastUpdateId);

public static string SendUpdate(int ConversationId, string update) {
    Conversation c = DAC.GetConversation(ConversationId);

    MailUpdate item = new MailUpdate();
    item.Author = SessionStateSink.IsTechnician ? 
	"Technician" : "Client";//you should populate this from user information.
    item.CssClass = SessionStateSink.IsTechnician ? 
	"tech" : "client";//you can leave this or find a different way of handling it.
    item.TimeStamp = DateTime.Now;
    item.Message = update;

    return "";

The jQuery / AJAX is where it gets a little fun:

//Sending the data!

    timeout: 15000, 
    type: "POST",
    cache: false, 
    contentType: "application/json; charset=utf-8", dataType: 'json',
    url: 'chat.aspx/SendUpdate',
    data: '{ConversationId:' + $("#ConversationId")[0].value + 
	',update:' + JSON.stringify(message) + '}'
//Receiving the Data! 
    timeout: 15000, 
    type: "POST",
    cache: false, 
    contentType: "application/json; charset=utf-8", 
    dataType: 'json',  
    url: 'chat.aspx/GetUpdates',
    data: '{ConversationId:' + $("#ConversationId")[0].value + 
	',LastUpdateId:' + $("#LastUpdateId")[0].value + '}',
    success: chat_populateItems
//Populating the Data! (Data displayed here is 
//reflective of the custom IMailMessage interface)
function chat_populateItems(data) {
    for (var index = 0; index < data.d.length; index++) {
        var item = data.d[index];
        if ($('#update' + item.UpdateId).length == 0) {
            var text = "(" + item.DateString + ") " + 
			item.Author + ": " + item.Message;
            $('#result').append("<div id='update" + item.Id + 
		"' class='" + item.CssClass + "' />").children(":last").text(text);
    if (data.d.length > 0) {
        $("#LastUpdateId")[0].value = data.d[data.d.length - 1].Id;

Note: I dropped error functions (etc.) out of the code above, to make it simpler to read here.

If you have questions or comments, please post!


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Software Developer
United States United States
likes boardgames, computer games, and enjoys his .net programming job.

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Comments and Discussions

Questionsolution file Pin
Member 1295979020-Jan-17 6:49
memberMember 1295979020-Jan-17 6:49 
GeneralMy vote of 4 Pin
shani_75930-Dec-12 20:04
membershani_75930-Dec-12 20:04 
Questionfile damaged Pin
AteşG3-Aug-12 4:07
memberAteşG3-Aug-12 4:07 
AnswerRe: file damaged Pin
ColinBashBash3-Aug-12 4:12
memberColinBashBash3-Aug-12 4:12 
GeneralRe: file damaged Pin
AteşG3-Aug-12 4:27
memberAteşG3-Aug-12 4:27 
GeneralRe: file damaged Pin
AteşG3-Aug-12 5:11
memberAteşG3-Aug-12 5:11 
QuestionGood stuff!! will try to improve and send back any comments! some question at last.. Pin
AndyHo21-May-12 4:19
memberAndyHo21-May-12 4:19 
AnswerRe: Good stuff!! will try to improve and send back any comments! some question at last.. Pin
ColinBashBash21-May-12 4:31
memberColinBashBash21-May-12 4:31 
GeneralRe: Good stuff!! will try to improve and send back any comments! some question at last.. Pin
AndyHo21-May-12 8:11
memberAndyHo21-May-12 8:11 
QuestionThank you thank you thank you!!!! Pin
Member 826925822-Nov-11 15:46
memberMember 826925822-Nov-11 15:46 
AnswerRe: Thank you thank you thank you!!!! Pin
ColinBashBash23-Nov-11 3:48
memberColinBashBash23-Nov-11 3:48 
GeneralJust what i need! Pin
_dr1v3r_27-Oct-10 0:59
member_dr1v3r_27-Oct-10 0:59 
GeneralRe: Just what i need! Pin
ColinBashBash27-Oct-10 3:23
memberColinBashBash27-Oct-10 3:23 

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