如何从datagridview到Label检查行数据

Question

我的代码有问题。我使用vb和mysql作为数据库。我也有datagridview，其中frist列是一个checkedboxcolumn。我想要的是：当用户选中复选框时，一些数据将自动显示在标签中。

我的代码在这里。实际上它正在运行。但问题是当我检查第二个复选框时，我首先检查的数据会显示。

Dim counter As Integer = 0
For Each oRow As DataGridViewRow In DataGridView1.Rows
    Dim isSelected As Boolean = Convert.ToBoolean(oRow.Cells("checkBoxColumn").Value)
    If Me.DataGridView1.Focused = True Then
        If isSelected = True Then
            counter += 1
            If counter = 1 Then
                oRow.DefaultCellStyle.BackColor = Color.Red
                Label17.Text = oRow.Cells("Book_ID").Value.ToString()
                Label25.Text = oRow.Cells("Call_Number").Value.ToString()
                Label21.Text = oRow.Cells("Title").Value.ToString()

                If oRow.Cells("checkBoxColumn").Value = False Then
                    Label17.Text = ""
                    Label25.Text = ""
                    Label21.Text = ""
                End If
            ElseIf counter = 2 Then
                oRow.DefaultCellStyle.BackColor = Color.Red
                Label20.Text = oRow.Cells("Book_ID").Value.ToString()
                Label26.Text = oRow.Cells("Call_Number").Value.ToString()
                Label19.Text = oRow.Cells("Title").Value.ToString()
                oRow.Cells("checkBoxColumn").Value = False
                MsgBox("You can Borrow 2 Books at a Time")

            End If
        End If
    End If
Next