DataGridview Remove Row and to Maintain the Serial No of Items

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VB

The Issue Is
I am adding Rows in a Datagridview
programmatically on Button Click
As

Dim s As Integer = Val(txtSlNo.Text)
        Dim c As Integer
        If s = 0 Then
            c = dgvInvoice.Rows.Count
            s = c + 1
            dgvInvoice.Rows.Add()
        Else
            c = s - 1
        End If
        dgvInvoice.Rows(c).Cells(0).Value = s.ToString()

This Snippet is on add Button click which is adding Row
and assigning Serial No to each row.
Next I have a button Delete Row .On the click event of Delete Button
am removing the Selected Rows as Below

For Each row As DataGridViewRow In dgvInvoice.SelectedRows
           Dim response As DialogResult = _
           MessageBox.Show( _
           "Are you sure you want to delete this row?", _
           "Delete row?", _
           MessageBoxButtons.YesNo, _
           MessageBoxIcon.Question, _
           MessageBoxDefaultButton.Button2)
           If (response = DialogResult.No) Then

           Else
               dgvInvoice.Rows.Remove(row)
           End If
       Next

Now the Problem is If the user Added Five rows In DatagridView
and removed the Row having Serial no 3 or any from the Datagridview.
I want that Serial no should also change Accordingly.
I think you understanding my Question.
How to Acheive this
Please assist.