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Winlogon.exe with high cpu usage

I have a .net website(4.0) running normally on server (windows server 2008 R2).

I have added some code to 4 of my pages and published dll using visual studio 2012.
After that i noticed that winlogon.exe cpu usage increased to 75%. Before changing dll it was 0% , and if reput old dll back without the new changes in code it comes back to 0%.

These are the only changes i have done to my website (same code for all 4 pages):

On Page_Init, I added this to each page to check if browser used is pad or mobile and if so transfer to corresponding page

Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init

InitializeComponent()
Dim userAgent = HttpContext.Current.Request.UserAgent.ToLower
If userAgent.Contains('ipad') Then
Server.Transfer('pageTablet.aspx')
ElseIf userAgent.Contains('android') = True And userAgent.Contains('mobi') = False Then
Server.Transfer('pageTablet.aspx')
ElseIf userAgent.Contains('mobi') Then '
Server.Transfer('pageMobile.aspx')
End If
End Sub

page.aspx ,pageTablet.aspx and pageMobile.aspx all have same vb.net code (tablet and mobile without page_init part), the only difference is in .aspx(html display)

When i use dll with this code, winlogon cpu usage increases and it affects website since cpu usage becomes 100%.And when i remove it everything works fine.

What is the relation between checking broswer type and server.transfer with winlogon.exe activity?

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Winlogon.exe with high cpu usage

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What is the carbon footprint of your coffee?