monodroid development using visual studio 2010

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C#

.NET

C#4.0

.NET4

I install java jdk,android sdk,visual studio 2010 and mono for android softwares to develop a mono droid apk.
Initially it create a project click the button, it can run successfuly on emulator and i try to install it on android mobile (samsung galaxy y)for that i search the (.apk file) in my project and it will locate it on bin/debug/filname.apk.here in this bin folder i have 2 apk file filename.apk and filename.signed.apk. I copied both apk file to my mobile and try to install file name.apk but it failed to install and try to install filename.signed.apk it will installed successfully, but when i try to open it on mobile it will force close automatically.

i dont know why it happens. is there any suggestions regarding this error is appreciable thanks in advance.