VB.Net Error: Reference to a non-shared member requires an object reference

 Please help i get this error when i try to run this code please help

error Reference to a non-shared member requires an object reference in VB.net

   Using Con As New SqlConnection(conString)
            Con.Open()
            Using Com As New SqlCommand("Select * From lugalvl", Con)
                Using RDR = Com.ExecuteReader()
                    If RDR.HasRows Then
                        Do While RDR.Read
                            Dim kk As String
                            kk = IIf(Countthreev2(RDR.Item("j16").ToString(), RDR.Item("j26").ToString(), RDR.Item("j36").ToString()), SCORE3(RDR.Item("j16").ToString(), RDR.Item("j26").ToString(), RDR.Item("j36").ToString()), "")
                        Loop
                    End If
                End Using
            End Using
            Con.Close()
        End Using
    End Sub

Imports Microsoft.VisualBasic

Public Class NewgradingforAlevel
    Public Function SCORE3(t1, t2, t3) As String

    End Function
End Class
 

Imports Microsoft.VisualBasic

Public Class Computescoresforalevel
    Public Function Countthreev2(a, b, c) As Boolean

        If String.IsNullOrEmpty(a) Or String.IsNullOrEmpty(b) Or String.IsNullOrEmpty(c) Then
            Countthreev2 = False
        Else
            Countthreev2 = True
        End If
    End Function
End Class