Member Avatar for freefika

Hello,
I'm currently developing a Chat Application in VB.NET which is similar to MSN Messenger. I need to know the control to use for the message area of the chat window in which the messages sent and recieved will be shown. I tried using the rich text box but it does not support hyperlinks and emoticons......so what control should i use? pls suggest

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  • Latest Post Latest Post by slimtugo

Dani AI

Generated

Short answer: for WinForms the easiest way to get clickable links and image emoticons is an HTML renderer (the WebBrowser control or a modern WebView2 host). If you want a fully native look you can build a message-bubble UI from small user controls inside a FlowLayoutPanel, but that requires more work.

As noted, an HTML approach gives the richest, fastest payoff: render each message as a bit of HTML (timestamp, username, message body with <img> tags for emoticons). Avoid repeatedly resetting DocumentText (it kills scroll position and performance) — append DOM nodes instead, and call ScrollIntoView on the newest element. Remember to HTML-encode user text to prevent injection.

Small VB.NET pattern (WinForms + WebBrowser) — append a sanitized fragment rather than replace the whole document:

' Requires System.Net (WebUtility) or System.Web (HttpUtility) for HtmlEncode
Dim safeUser As String = WebUtility.HtmlEncode(userName)
Dim safeMsg  As String = WebUtility.HtmlEncode(message).Replace(vbCrLf, "<br/>")
Dim fragment As String = "<div class='msg'><span class='time'>" & DateTime.Now.ToString("HH:mm") & _
                         "</span> <b>" & safeUser & ":</b> " & safeMsg & "</div>"

If WebBrowser1.Document Is Nothing Then
    WebBrowser1.DocumentText = "<html><head><style>body{font-family:Segoe UI}</style></head><body>" & fragment & "</body></html>"
Else
    Dim doc = WebBrowser1.Document
    Dim el = doc.CreateElement("div")
    el.InnerHtml = fragment
    doc.Body.AppendChild(el)
    el.ScrollIntoView(False)
End If

Notes, pitfalls and alternatives:

  • RichTextBox can detect URLs (DetectUrls) and embed images via RTF/OLE, but it is awkward for mixed HTML-style formatting.
  • WPF’s FlowDocument/RichTextBox gives better inline images and hyperlinks if you can use WPF or host it in WinForms.
  • For a native bubble UI, use a FlowLayoutPanel with per-message UserControls (LinkLabel + PictureBox).
  • Security: always encode/sanitize input, disable script execution in embedded browsers, and limit DOM size by pruning old messages.
  • Networking: tie the UI to a robust transport (sockets/TcpClient or higher-level frameworks). As and pointed out, the UI and the networking layers are separate concerns; secure the transport (TLS) for production.

These approaches let you support hyperlinks, images/emoticons, and flexible styling while keeping control of performance and security.

Recommended Answers

All 5 Replies

Member Avatar for Inanna

The easiest way would prolly be to use a WebBrowser object. :) Otherwise you're looking at a custom control.

commented: good ans. +0
Member Avatar for suresh_tekh

Hello i want to develop a chat application in .net... Can you suggest any Idea to develop the application... (Urgent) plz...

Member Avatar for emurf

You need to use the Winsock control (an example: ) or another socket control like secure socket library (example: ). Secure socket library may be a better choice since most examples of winsock that you find will be in VB6.

Member Avatar for slimtugo

Hello i want to develop a chat application in .net... Can you suggest any Idea to develop the application... (Urgent) plz...

Hi
If you are really interested in building a chat application the likes of yahoo messenger send me an email. We could work together.

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