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    <p>After a lot of research and trial and error, I discovered a solution to this issue. However, this solution does not work for the first request that the user makes because it is impossible to determine if a user supports cookies from only one request.</p> <p>I came up with a clever solution that uses AJAX to make a second (invisible) request to the server in order to write settings to the profile on the first request, but only if cookies and JavaScript are enabled. Of course, if you are not storing any profile settings on the initial request, it is not necessary to use this. See my <a href="https://stackoverflow.com/questions/3884840/are-there-more-efficient-alternatives-to-asp-net-2-0-anonymous-profiles">other post</a> for complete details.</p> <pre><code>Imports System.Web.Configuration Public MustInherit Class AnonymousProfile Inherits ProfileBase Public Shared ReadOnly Property AnonymousCookieName() As String Get Dim anon As AnonymousIdentificationSection = CType(ConfigurationManager.GetSection("system.web/anonymousIdentification"), AnonymousIdentificationSection) Return anon.CookieName End Get End Property Public Shared ReadOnly Property IsAnonymousCookieStored() As Boolean Get Dim cookies As String = HttpContext.Current.Request.Headers("Cookie") Return Not String.IsNullOrEmpty(cookies) AndAlso cookies.IndexOf(AnonymousCookieName) &gt; -1 End Get End Property Private ReadOnly Property IsWritable() As Boolean Get Return IsAnonymous = False OrElse IsAnonymous AndAlso IsAnonymousCookieStored End Get End Property Private Function IsObjectMatch(ByVal obj1 As Object, ByVal obj2 As Object) As Boolean If Not obj1 Is Nothing Then Return obj1.Equals(obj2) Else If obj2 Is Nothing Then Return True Else Return False End If End If End Function Public Overloads Sub SetPropertyValue(ByVal propertyName As String, ByVal propertyValue As Object) If (Not IsObjectMatch(Me.GetPropertyValue(propertyName), propertyValue)) AndAlso IsWritable Then MyBase.SetPropertyValue(propertyName, propertyValue) End If End Sub Public Overrides Sub Save() If IsWritable Then MyBase.Save() End If End Sub End Class </code></pre> <p>Simply put, this class prevents the profile from being written to or saved if the profile is anonymous and the anonymous cookie hasn't been received from the browser yet.</p> <p>In order to use this class, put it into the App_Code directory and add an "inherits" attribute to the profile element in the web.config file as follows:</p> <pre><code>&lt;profile defaultProvider="SqlProvider" inherits="AnonymousProfile"&gt; </code></pre> <p>ASP.NET will then inherit the ProfileCommon class from this one when it is automatically generated.</p> <p>Note that the AnonymousCookieName and IsAnonymousCookieStored properties were made public shared so they can be used anywhere else in the project like this:</p> <pre><code>If AnonymousProfile.IsAnonymousCookieStored Then 'It is safe to write to the profile here End If </code></pre> <p>This can save some CPU cycles from executing code that doesn't need to run if the user rejected the anonymous cookie, but isn't strictly necessary because the new profile class will check anyway.</p> <p>There is also another bug fix included in this sample - the original profile class will be "Dirty" if you set a property to the same value it already contains, which will cause it to update the database even though nothing has changed. There is a check for this condition in the overloaded SetPropertyValue method which fixes this problem.</p> <pre><code>Public Overloads Sub SetPropertyValue(ByVal propertyName As String, ByVal propertyValue As Object) If (Not IsObjectMatch(Me.GetPropertyValue(propertyName), propertyValue)) AndAlso IsWritable Then MyBase.SetPropertyValue(propertyName, propertyValue) End If End Sub </code></pre> <p>Reference: <a href="http://msdn.microsoft.com/en-us/library/system.web.profile.profilebase(v=VS.80).aspx" rel="nofollow noreferrer">ProfileBase Class (MSDN)</a></p>
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