How do I compare my sample fingerprint on the fingerprint stored on my database

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VB

SQL-Server

fingerprint

Dim conn As SqlConnection = MainForm.con()
Dim cmd As New SqlCommand()
cmd.Connection = MainForm.con()
cmd.CommandText = "select * from fprintt"
Dim rdr As SqlDataReader = cmd.ExecuteReader()
While rdr.Read()
Dim MemStream As IO.MemoryStream
Dim fpBytes As Byte()

fpBytes = rdr("Finger")
MemStream = New IO.MemoryStream(fpBytes)

Dim templa8 As DPFP.Template = New DPFP.Template()
templa8.DeSerialize(MemStream)


Dim FPList As List(Of AppData) = New List(Of AppData)
Dim tmpObj As New AppData
FPList.Add(tmpObj)
Dim printFound As Boolean = False
Dim VerifiedFPData = New AppData
Try
For Each FPData As AppData In FPList
Dim tmplateData As New DPFP.Template
VerifiedFPData = FPData
Dim compareTo As New DPFP.FeatureSet
compareTo = FeatureSet()

Dim ver As New DPFP.Verification.Verification()
Dim res As New DPFP.Verification.Verification.Result()

If Not tmplateData Is Nothing Then
ver.Verify(FeatureSet, tmplateData, res)

If res.Verified Then
'EventHandlerStatus = DPFP.Gui.EventHandlerStatus.Success
printFound = True
VerifiedFPData = FPData
Exit For ' success
End If
End If
Next
Catch ex As Exception
MessageBox.Show("verification error")
End Try

what is wrong with my code cant compare my sample fingerprint in all the fingerprint stored on my database?

Im using
VB.net
Sql server 2008
4000B Sensor
ZKSoftware
model: URU4S-U1

This is the sample stored in my database as fingerprint:
0x00F88001C82AE3735CC0413709AB717082145592DED883716A5D64C0D0B4382366C2A4FEAA21EABA2D2A954CC352B3B9FA33FDD88D6E9EA5FA9ECCF428270D296F150DA94F89100BD0F350C66E9972EDB05334E4457A6E.....

What I have tried:

I have already tried some sample codes on google