Get count of datagridview inside a thread

[Christhemist]

Update: It does not appear that I can access anything from the DataGridView from within my thread.... I am trying to just simply pull some information from a cell and I am getting this error: "Index was out of range. Must be non-negative and less than the size of the collection." Why is it not working with my DataGridView????

I am trying to loop through my DataGridView using a thread, but it does not appear to be getting the proper count; therefor it is unable to loop through my DataGridView.

Notes: My DataGridView is on a separate form and is being populated before the thread is executed. The thread is executed by a button on a separate form from the DataGridView.

Here is the code from the form trying to run the thread: (The code in bold returns a value of -1)

Public thread_UpdateDGVCheckBox As Threading.Thread


Private Sub ThreadedDGVCheckBoxUpdate()

        Dim TST As String
        Dim StringCnt As Integer

        StringCnt = DGV_Form.DataGridView1.RowCount - 1
        MsgBox(StringCnt)

        For counter As Int32 = 0 To DGV_Form.DataGridView1.RowCount - 1
            TST = DGV_Form.DataGridView1.Item(3, DGV_Form.DataGridView1.Rows(counter).Index).Value.ToString()
            If TST = "loc_132" Then
                DGV_Form.Invoke(Sub()
                                        DGV_Form.DataGridView1.CurrentRow.DefaultCellStyle.ForeColor = Color.Red
                                        DGV_Form.DataGridView1(0, DGV_Form.DataGridView1.Rows(counter).Index).Value = True
                                    End Sub)
            End If
        Next
    End Sub



Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button11.Click

        thread_UpdateDGVCheckBox = New Threading.Thread(AddressOf ThreadedDGVCheckBoxUpdate)
        thread_UpdateDGVCheckBox.Start()

End Sub