How to save finger print in sql ?

Can anyone here review my code because it is not working
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()
Dim MemStream As IO.MemoryStream
Dim fpBytes As Byte()
Dim templa8 As DPFP.Template = New DPFP.Template()
Dim FPList As List(Of AppData) = New List(Of AppData)
Dim tmpObj As New AppData
Dim VerifiedFPData = New AppData
Dim ver As New DPFP.Verification.Verification()
Dim res As New DPFP.Verification.Verification.Result()
Dim compareTo As New DPFP.FeatureSet
Dim tmplateData As New DPFP.Template
Dim fingerprintData As MemoryStream = New MemoryStream
Dim brr As BinaryReader = New BinaryReader(fingerprintData)
Dim bytes() As Byte = brr.ReadBytes(CType(fingerprintData.Length, Int32))
While rdr.Read()
fpBytes = rdr("Finger")
MemStream = New IO.MemoryStream(fpBytes)
templa8.DeSerialize(MemStream)
End While
FPList.Add(tmpObj)
Dim printFound As Boolean = False
Try
For Each FPData As AppData In FPList
Template = templa8
compareTo = FeatureSet()
If Not tmplateData Is Nothing Then
ver.Verify(FeatureSet, tmplateData, res)
If res.Verified Then
'EventHandlerStatus = DPFP.Gui.EventHandlerStatus.Success
printFound = True
Template = templa8
Exit For ' success
End If
End If
Next
Catch ex As Exception
MessageBox.Show("verification error")
End Try