/// <summary>
/// Show occured error.
/// </summary>
private void gxFile1_OnError(object sender, string ErrorInfo)
{
    try
    {
        MessageBox.Show(ErrorInfo);
    }
    catch (Exception Ex)
    {
        MessageBox.Show(this, Ex.Message);
    }
}

                ''' <summary>
''' Show occured error.
''' </summary>
Private Sub GxFile1_OnError(ByVal sender As System.Object, ByVal ErrorInfo As System.String) Handles GxFile1.OnError
    Try
        MessageBox.Show(ErrorInfo)
    Catch Ex As Exception
        MessageBox.Show(Ex.Message)
    End Try
End Sub

                'Show occured error
Private Sub GXFile1_OnError(ByVal sender As Object, ByVal ErrorInfo As String)
On Error GoTo GXErr
    MsgBox ErrorInfo
    GXFile1.Close
    Exit Sub
GXErr:
    MsgBox Err.Description
End Sub