saving base64string to access text field

[ghost807]

i am trying to save a text string that has been hashed using sha1 service provider.
when i try to store the hash to the database i get a sql error stating
"Syntax Error In UPDATE Statement"
yet i am using the exact same lines of code to do updates else where in the program.
my only clue is the base64string conversion.
here is the hash code.

        Dim SHA1 As SHA1CryptoServiceProvider
        Dim bytValue() As Byte
        Dim bytHash() As Byte

        ' Create New Crypto Service Provider Object
        SHA1 = New SHA1CryptoServiceProvider

        ' Convert the original string to array of Bytes
        bytValue = _
         System.Text.Encoding.UTF8.GetBytes(txtNewPass2.Text)

        ' Compute the Hash, returns an array of Bytes
        bytHash = SHA1.ComputeHash(bytValue)

        SHA1.Clear()

        ' Return a base 64 encoded string of the Hash value
        z = Convert.ToBase64String(bytHash)

and here is the udpate command, it's not pretty yet but it will be when i'm done.

        Dim connect As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & DBPath
        Dim conn As New OleDbConnection(connect)
        Dim adapter As New OleDbDataAdapter
        Dim sqlString As String = "SELECT * FROM tblEmployees"
        adapter.SelectCommand = New OleDbCommand(sqlString, conn)
        Dim cmdBuilder As OleDbCommandBuilder = New OleDbCommandBuilder(adapter)
        Dim BarCodeUpdate As New Database

        Try
            conn.Open()

            ' update the record
            adapter.TableMappings.Add("Table", "tblEmployees")
            adapter.Fill(BarCodeUpdate.Tables("tblEmployees"))

            Dim idx As Integer
            'Dim nullVal As DBNull
            For idx = 0 To BarCodeUpdate.tblEmployees.Rows.Count - 1
                'If BarCodeUpdate.tblMovie(idx).BarCode.ToUpper = BarCode Then
                If BarCodeUpdate.tblEmployees(idx).Employee = txtUserName.Text.ToUpper Then
                    BarCodeUpdate.tblEmployees(idx).Password = z
                End If
                'End If
            Next

            adapter.Update(BarCodeUpdate)
            BarCodeUpdate.Dispose()
            adapter.Dispose()
            conn.Dispose()
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try