set new DataGridViewComboBoxCell for after validation of previous DataGridViewTextBoxCell in same column and row - vb.net

Question

I have this DataGridView and it has a DataGridViewTextBoxColumn where user can type a number, and after he types it I perform a search to find previous records under that number.
I want to show this records so user can select one of them, or keep the value typed, which means he wants to create a new record.
For that, I want to replace each DataGridViewTextBoxCell for a DataGridViewComboBoxCell with those options when user has finished typing.
However, it is raising this exception when I try to permform this replacement: "System.InvalidOperationException" in System.Windows.Forms.dll. Additional information: The operation is not valid because it results in a reentering call to the function SetCurrentCellAddressCore.
Here is my code (I already tried to handle CellLeave instead of CellValidated):
Private Sub DataGridViewDebitos_CellValidated(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridViewDebitos.CellValidated
DataGridViewDebitos.EndEdit(DataGridViewDataErrorContexts.Commit)
If e.ColumnIndex = ColumnDebito.Index Then
Dim cellDebito = DataGridViewDebitos.Rows(e.RowIndex).Cells(ColumnDebito.Index)
Dim numDebito = String.Concat(If(cellDebito.Value, "").ToString.Where(Function(c) Char.IsLetterOrDigit(c)))
If TypeOf cellDebito Is DataGridViewTextBoxCell AndAlso numDebito.Length >= 3 Then
Dim prcsa As New List(Of JObject) 'In real version, prcsa is populated by an external function, but it doesn't affect the result
Dim j = New JObject
j.SetProperty("id", 0)
j.SetProperty("nome", cellDebito.Value)
prcsa.Insert(0, j) 'This option is always present, it allows user to keep simply what was typed
'Exception hapens here
DataGridViewDebitos(cellDebito.ColumnIndex, cellDebito.RowIndex) =
New DataGridViewComboBoxCell With {
.DataSource = prcsa,
.DisplayMember = "nome",
.FlatStyle = FlatStyle.Flat,
.ValueMember = "id",
.Value = prcsa(0).Value(Of Integer)("id")}
End If
End If
End Sub
Thank you very much

Answer 1

I've put the problematic statement into a Lambda sub via .BeginInvoke and this solved the problem, only I don't know why...
Can anyone explain the mechanics of it to me? Thank you!
Private Sub DataGridViewDebitos_CellValidated(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridViewDebitos.CellValidated
DataGridViewDebitos.EndEdit(DataGridViewDataErrorContexts.Commit)
If e.ColumnIndex = ColumnDebito.Index Then
Dim cellDebito = DataGridViewDebitos.Rows(e.RowIndex).Cells(ColumnDebito.Index)
Dim numDebito = String.Concat(If(cellDebito.Value, "").ToString.Where(Function(c) Char.IsLetterOrDigit(c)))
If TypeOf cellDebito Is DataGridViewTextBoxCell AndAlso numDebito.Length >= 3 Then
Dim prcsa As New List(Of JObject) 'In real version, prcsa is populated by an external function, but it doesn't affect the result
Dim j = New JObject
j.SetProperty("id", 0)
j.SetProperty("nome", cellDebito.Value)
prcsa.Insert(0, j) 'This option is always present, it allows user to keep simply what was typed
'Exception hapens here
DataGridViewDebitos.BeginInvoke(
Sub()
DataGridViewDebitos(cellDebito.ColumnIndex, cellDebito.RowIndex) =
New DataGridViewComboBoxCell With {
.DataSource = prcsa,
.DisplayMember = "nome",
.FlatStyle = FlatStyle.Flat,
.ValueMember = "id",
.Value = prcsa(0)("id")}
End Sub)
End If
End If
End Sub