Получение данных контрола из строковой переменной

sStr="1: [2]+[4]+[5]-[11]>[3]-[6]"

dgw.item(0,1).value+dgw.item(0,3).value+dgw.item(0,4).value-dgw.item(0,10).value>dgw.item(0,2).value-dgw.item(0,5).value

sStr="1: [2]+[4]+[5]-[11]>[3]-[6]"

Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
    Dim condi As String = Label1.Text
    Dim expr() As String = condi.Split({"<"c, ">"c, "="c}, StringSplitOptions.RemoveEmptyEntries)
    Dim ss1() As String = expr(0).Split({"]"c, "["c}, StringSplitOptions.RemoveEmptyEntries)
    Dim ss2() As String = expr(1).Split({"]"c, "["c}, StringSplitOptions.RemoveEmptyEntries)
    Dim cnd As String = ""
    If condi.Contains(">") Then cnd += ">"
    If condi.Contains("<") Then cnd += "<"
    If condi.Contains("=") Then cnd += "="
    For i = 0 To DataGridView1.Rows.Count - 2
        DataGridView1.Rows(i).Cells(0).Value = getBValue(ss1, ss2, cnd, i).ToString
    Next
End Sub
Private Function getBValue(ByVal s1() As String, ByVal s2() As String, ByVal cn As String, ByVal jj As Integer) As Boolean
    Dim rw As DataGridViewRow = DataGridView1.Rows(jj)
    Dim r1 As Integer = getValue(s1, rw)
    Dim r2 As Integer = getValue(s2, rw)
    Dim bb As Boolean
    Select Case cn
        Case ">"
            bb = r1 > r2
        Case "<"
            bb = r1 < r2
        Case "="
            bb = r1 = r2
        Case "<>"
            bb = r1 <> r2
        Case ">="
            bb = r1 >= r2
        Case "<="
            bb = r1 <= r2
        Case Else
    End Select
    Return bb
End Function
Private Function getValue(ByVal ss() As String, ByVal rr As DataGridViewRow) As Integer
    Dim sum As Integer = CInt(ss(0))
    For i = 1 To ss.Length - 1 Step 2
        Select Case ss(i)
            Case "+"
                sum += CInt(rr.Cells((CInt(ss(i + 1)) - 1)).Value)
            Case "-"
                sum -= CInt(rr.Cells((CInt(ss(i + 1)) - 1)).Value)
            Case Else
        End Select
    Next
    Return sum
End Function

Dim sum As Integer = CInt(rr.Cells(CInt(ss(0)) - 1).Value)

Public Class Calculator
    Private _str As String
    Private ss1(), ss2() As String
    Private cnd As String = ""
    Public Sub New(ByVal str As String)
        _str = str
        Dim expr() As String = _str.Split({"<"c, ">"c, "="c}, StringSplitOptions.RemoveEmptyEntries)
        ss1 = expr(0).Split({"]"c, "["c}, StringSplitOptions.RemoveEmptyEntries)
        ss2 = expr(1).Split({"]"c, "["c}, StringSplitOptions.RemoveEmptyEntries)
        If _str.Contains(">") Then cnd += ">"
        If _str.Contains("<") Then cnd += "<"
        If _str.Contains("=") Then cnd += "="
    End Sub
    Public Function Calculate(ByVal rr As DataGridViewRow) As Boolean
        Dim bb As Boolean
        Dim r1 As Integer = getValue(ss1, rr)
        Dim r2 As Integer = getValue(ss2, rr)
        Select Case cnd
            Case ">"
                bb = r1 > r2
            Case "<"
                bb = r1 < r2
            Case "="
                bb = r1 = r2
            Case "<>"
                bb = r1 <> r2
            Case ">="
                bb = r1 >= r2
            Case "<="
                bb = r1 <= r2
            Case Else
        End Select
        Return bb
    End Function
    Private Function getValue(ByVal ss() As String, ByVal rr As DataGridViewRow) As Integer
        Dim sum As Integer = CInt(rr.Cells(CInt(ss(0)) - 1).Value)
        For i = 1 To ss.Length - 1 Step 2
            Select Case ss(i)
                Case "+"
                    sum += CInt(rr.Cells((CInt(ss(i + 1)) - 1)).Value)
                Case "-"
                    sum -= CInt(rr.Cells((CInt(ss(i + 1)) - 1)).Value)
                Case Else
            End Select
        Next
        Return sum
    End Function
End Class

Private Sub Button3_Click(sender As System.Object, e As System.EventArgs) Handles Button3.Click
    Dim calc As New Calculator(Label1.Text)
    For i = 0 To DataGridView1.Rows.Count - 2
        DataGridView1.Rows(i).Cells(0).Value = calc.Calculate(DataGridView1.Rows(i)).ToString
    Next
End Sub