Adnan Rashid

Web Technologist…

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Tag Archives: asp.net

Unlike the normal TextBox, the MaxLength property doesnt work for MultiLine TextBox. Heres a small trick to solve the problem:

<asp:TextBox ID="txtExample" runat="server" TextMode="MultiLine" />

<asp:RegularExpressionValidator ID="revExample" runat="server"
ControlToValidate="txtExample" ValidationExpression="[\s\S]{1,200}"
Display="Dynamic" ErrorMessage="Length cannot be greater than 200 characters" />

The above markup validates the revExample TextBox / textarea and limits the max characters to 200. By modifying the regular expressions, [...]

Tip to debug a running instance of an application

I needed to integrate support for vCalendar in my current project. So i went through the vCalendar spec 1.0 at http://www.imc.org/pdi/vcal-10.txt and wrote this class. Although I have not implemented all the specification features, but this should prove sufficient for the usual requirements. If you have any comments / suggestions , let me know.

using System;
using [...]

Heres a quick tip. If you need to include a request for read receipt like Microsoft Outlook while sending mails through Asp.net, just add the Disposition-Notification-To Header to the MailMessage.
The MailMessage class does not have a corresponding attribute and thus it has to be set through the Header.

MailMessage mm = new MailMessage(fromAddress, toAddress);
mm.Subject = subject;
mm.Headers.Add("Disposition-Notification-To", [...]

In my current project I needed to access the Session state in a Generic Handler. To my dismay, i realized that the Session StateBag was null. The StateBag class is sealed and manages the Viewstate of the Asp.net server controls and pages.
Upon discussion with my colleague, Mr. Hamed, we found the solution to my problem. [...]

When you pass information from one page to another, you are passing information that anybody can sniff. For example consider a scenario, in which you pass the customer id as a query string:
http://www.yourapplication.com?customer_id=15
Now if somebody replaced 15 with say 10 or any other number, they can pull up other customer information. And thats a bad [...]

If you are using Membership Provider in your ASP.net application, you might come across a scenario in which you need to have both Security Question and Answer feature and would also like to programmatically reset the password for an account.
So if you run the code

string username = “user”;
string password = “password”;
MembershipUser mu = Membership.GetUser(username);
mu.ChangePassword(mu.ResetPassword(), password);

You [...]