不显示文本框中的总价格

Question

Dim totalValue As Integer
For Each dgvRow As DataGridViewRow In DataGridView2.Rows
    If Not dgvRow.IsNewRow Then
        totalValue += CInt(dgvRow.Cells(3).Value)
    End If
Next
TextBox4.Text = totalValue

我对此代码有问题，它没有显示第3列的总价格或我将其放入表单加载的总列