The problem

When you run the ASP.NET development server out of Visual Studio, you’ll be prompted by Firefox or IE for a username and password before you can continue.

The following solutions worked for me using Windows 7, Visual Studio 2008 & 2010 with Firefox 3 and Internet Explorer 8.

Firefox solution

Type about:config into the address bar to open the Firefox configuration area.

Locate the following lines under the preference name column, double click the row and enter localhost into the value.

network.automatic-ntlm-auth.trusted-uris
network.negotiate-auth.delegation-uris
network.negotiate-auth.trusted-uris

Internet explorer solution

Menu: Tools -> Internet Options

Tab: Security

Click on the Trusted Sites icon and then the Sites button below.  In the textbox type localhost. Click the add button and the URL should appear below. Click Close.

Now click on the Local Intranet icon and the Sites button below.  Uncheck automatically detect intranet network. Check Include all local (intranet) sites not listed in other zones. Click OK. Click OK.

I recently used the calendar control from the AJAX toolkit to set a date in its associated textbox control. I wanted the user to only be able to set the date through the calendar control so I made the textbox read only by setting the ReadOnly property to true. The problem this produces is that readonly controls don’t post back their values in the viewstate thus you lose the value when the user submits the form.

The solution

After some research the easiest workaround I found was this.

Leave the textbox control property as ReadOnly = False

In the Page Load event set the client side attribute of the textbox with the following:

txtDate.Attributes.Add(“readonly”, True)

This way the control is included in the postback and the value is preserved but client side the user won’t be able to manually edit it.