public int RowHandle { get; }

Public ReadOnly Property RowHandle As Integer

using DevExpress.XtraGrid.Views.Grid;

gridView1.EditFormShowing += new EditFormShowingEventHandler(OnEditFormShowing);
//...
private void OnEditFormShowing(object sender, EditFormShowingEventArgs e) {
    GridView view = sender as GridView;
    if (view == null) return;
    if (view.GetRowCellValue(e.RowHandle, "ShipCountry").ToString() == "France") e.Allow = false;
}

Imports DevExpress.XtraGrid.Views.Grid

AddHandler GridView1.EditFormShowing, AddressOf OnEditFormShowing
'...
Private Sub OnEditFormShowing(sender As Object, e As EditFormShowingEventArgs)
    Dim view As GridView = TryCast(sender, GridView)
    If view Is Nothing Then
        Return
    End If
    If view.GetRowCellValue(e.RowHandle, "ShipCountry").ToString() = "France" Then
        e.Allow = False
    End If
End Sub

e.Allow = false;
var row = gridView1.GetRow(e.RowHandle) as DevExpress.Data.Async.Helpers.ReadonlyThreadSafeProxyForObjectFromAnotherThread;
if(row != null) {

if(gridView.GetRow(e.RowHandle) is Employee employee) {
    using(var editForm = new EditForm(employee, middleTierClient)) {

Dim employee As Employee = Nothing
If CSharpImpl.__Assign(employee, TryCast(gridView.GetRow(e.RowHandle), Employee)) IsNot Nothing Then
    Using editForm = New EditForm(employee)