vb.net ต้องการส่งข้อมูลข้ามฟอร์ม ส่งแบบธรรมดาใช้งานได้ แต่ส่งข้อมูลไปยังฟอร์มที่เรียกจาก MDI Form ไม่ได้ครับ

Private Sub DataGridView1_CellMouseDoubleClick(sender As System.Object, e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles DataGridView1.CellMouseDoubleClick
If e.RowIndex = -1 OrElse e.RowIndex = DataGridView1.RowCount Then Exit Sub

frmIncomeExpense.GetDataExpenseToCombobox()
frmIncomeExpense.cboExpense.Refresh()
tbxDetails.Enabled = True
Dim sql As String = ""
connAccessDB()
With DataGridView1
  Dim statusCatExpense As Integer = CInt(.Rows(e.RowIndex).Cells(0).Value) 'รหัสประเภทค่าใช้จ่าย
  expense = statusCatExpense
  My.Forms.frmIncomeExpense.cboExpense.Enabled = True
  My.Forms.frmIncomeExpense.cboExpense.Text = .Rows(e.RowIndex).Cells(1).Value.ToString
  My.Forms.frmIncomeExpense.tbxDetails.Text = .Rows(e.RowIndex).Cells(2).Value.ToString
  My.Forms.frmIncomeExpense.tbxPrice.Value = CDbl(.Rows(e.RowIndex).Cells(3).Value)
End With
connAccess.Close()
DrA.Close()
Me.Close()
End Sub
End Class

Public Class frmMain
Public fIncomeExpense As frmIncomeExpense
Private Sub btnIncome_Click(sender As System.Object, e As System.EventArgs) Handles btnIncomeExpense.Click
    'เรียก form มาแสดง
  fIncomeExpense = New frmIncomeExpense
  fIncomeExpense.MdiParent = Me
  fIncomeExpense.Show()
End Sub
End Class

Public Class frmIncomeExpense
Dim fCatExpense As frmCatExpense
Private Sub btnAddCatExpense_Click(sender As System.Object, e As System.EventArgs) Handles btnAddCatExpense.Click
  fCatExpense = New frmCatExpense
  fCatExpense.ShowDialog()  'เรียกใช้ฟอร็ม fcatExpense ให้แสดง
 End Sub
 End Class