Visual Basic 2005, подпрограммы. Помогите найти ошибку в коде

Код, который я написала

Public Class Form1
Function Center(ByVal k As Integer(), ByVal l As Integer(), ByVal n As Integer())
Dim t As Integer
t = Val(TextBox4.Text)

Dim a(,) As Single
ReDim a(0 To t - 1, 2)
Dim m() As Single
ReDim m(0 To t - 1)
Dim xc, yc, zc, x, y, z, sm As Double
Dim i, j As Integer

For i = 0 To t - 1
For j = 0 To 2
a(i, j) = Me.DataGridView1.Item(j, i).Value
Next j
Next i

For i = 0 To t - 1
m(i) = Me.DataGridView2.Item(0, i).Value
Next i

x = 0
y = 0
z = 0
sm = 0
For i = 0 To t - 1
x = x + a(i, 0) * m(i)
y = y + a(i, 1) * m(i)
z = z + a(i, 2) * m(i)
sm = sm + m(i)
Next

xc = x / sm
yc = y / sm
zc = z / sm

Return xc
Return yc
Return zc
End Function

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim k, l, n As Integer
Dim xc, yc, zc As Integer

k = Center(xc)
l = Center(yc)
n = Center(zc)

TextBox1.Text = CStr(Format(k, "0.000"))
TextBox2.Text = CStr(Format(l, "0.000"))
TextBox3.Text = CStr(Format(n, "0.000"))
End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Application.Exit()
End Sub
End Class

Ошибку выдает в этом куске:
k = Center(xc)
l = Center(yc)
n = Center(zc)

Пишет, что отсутствуют аргументы для параметров k, l, n в Public Function Center(k As Integer(), l As Integer(), n As Integer())

Никак не могу понять, чего он вообще от меня хочет и как эти самые аргументы получить :-(