private void bNamePdf_Click(object sender, RoutedEventArgs e) { var checkData = new CheckData(); var setterLower = new SetterLower(); var namepdf = string.Empty; namepdf = tbNamePdf.Text; if (checkData.Check(namepdf)) { pdfname.SetNamePdf(setterLower.SetLower(namepdf)); MessageBox.Show("PDF name created!"); } }