How to switch between two CultureInfo and vice-versa, dynamically in a WinForms GridControl with the Formula CellType?

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
   string culName = "";
   switch (this.comboBox1.SelectedIndex)
   {
      case 0:
              culName = "en-GB";
              break;
      //English united states
      case 1:
              culName = "en-US";
              break;
      //German culture
      case 2:
              culName = "de-DE";
              break;
   }

   //clear the grid
   this.gridControl1.RowCount = 0;
   this.gridControl1.RowCount = 10;
   this.gridControl1.ColCount = 5;

   //Passing the new culture name and setting the CultureInfo
   System.Globalization.CultureInfo ci = null;
   if (culName.Length == 0)
   {
      ci = System.Globalization.CultureInfo.CurrentCulture;
   }
   else
   {
      ci = new System.Globalization.CultureInfo(culName);
   }

   //Assigning the new culture to Grid's CultureInfo
   this.gridControl1.TableStyle.CultureInfo = ci;
   Application.CurrentCulture = ci;
   GridFormulaEngine.ParseDecimalSeparator = Application.CurrentCulture.NumberFormat.NumberDecimalSeparator.ToCharArray()[0];
   GridFormulaEngine.ParseArgumentSeparator = Application.CurrentCulture.TextInfo.ListSeparator.ToCharArray()[0];
   this.label1.Text = "Current Culture for the grid: " + ci.Name;
}

Private Sub comboBox1_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
   Dim culName As String = ""
   Select Case Me.comboBox1.SelectedIndex
       Case 0
                culName = "en-GB"
       'English united states
       Case 1
                culName = "en-US"
       'German culture
       Case 2
               culName = "de-DE"
       End Select

   'clear the grid
   Me.gridControl1.RowCount = 0
   Me.gridControl1.RowCount = 10
   Me.gridControl1.ColCount = 5

   'Passing the new culture name and setting the CultureInfo
   Dim ci As System.Globalization.CultureInfo = Nothing
   If culName.Length = 0 Then
     ci = System.Globalization.CultureInfo.CurrentCulture
   Else
     ci = New System.Globalization.CultureInfo(culName)
   End If

   'Assigning the new culture to Grid's CultureInfo
   Me.gridControl1.TableStyle.CultureInfo = ci
   Application.CurrentCulture = ci
   GridFormulaEngine.ParseDecimalSeparator = Application.CurrentCulture.NumberFormat.NumberDecimalSeparator.ToCharArray()(0)
   GridFormulaEngine.ParseArgumentSeparator = Application.CurrentCulture.TextInfo.ListSeparator.ToCharArray()(0)
   Me.label1.Text = "Current Culture for the grid: " & ci.Name
End Sub