如何對 DataGridView 金額列自動求和 VB.NET

Question

當我添加數字時，我如何對 Datagridview Column 自動求和我使用了下面的代碼但不起作用

 Private Sub DataGridView1_RowLeave(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.RowLeave
  Dim sum = (From row As DataGridViewRow In DataGridView1.Rows.Cast(Of DataGridViewRow)() _
    Select CDec(row.Cells(1).Value)).Sum
        TextBox1.Text = sum.ToString
        End Sub

Answer 1

Dim sum As Integer = 0
        For i As Integer = 0 To DataGridView1.Rows.Count() - 1 Step +1
            sum = sum + DataGridView1.Rows(i).Cells(2).Value
        Next
        TextBox5.Text = sum.ToString()

Answer 2

像這樣嘗試

Dim total As Integer = DataGridView1.Rows.Cast(Of DataGridViewRow)().Sum(Function(t) Convert.ToInt32(t.Cells(1).Value))
TextBox1.Text = total.tostring()