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Код

        private void button_Transform_Click(object sender, EventArgs e)
        {
            ApplicationClass appXML = new ApplicationClass();
            XMLValidator validator = appXML.XMLValidator;
            XSLT2 xslt2 = appXML.XSLT2;

            bool isWellformed;
            validator.InputXMLFileName = textBox_XmlSource.Text;
            this.Cursor = System.Windows.Forms.Cursors.WaitCursor;
            isWellformed = validator.IsWellFormed();
            this.Cursor = System.Windows.Forms.Cursors.Default;

            if (isWellformed) // если источник валидный
            {

                xslt2.InputXMLFileName = textBox_XmlSource.Text;
                xslt2.XSLFileName = textBox_XsltSourse.Text;
                try
                {
                    this.Cursor = System.Windows.Forms.Cursors.WaitCursor;
                    xslt2.Execute(OutFileName());
                    this.Cursor = System.Windows.Forms.Cursors.Default;
                }
                catch (Exception ex)
                {
                    this.Cursor = System.Windows.Forms.Cursors.Default;
                    MessageBox.Show(ex.Message, "Transformation error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }

            }
            else
            { 
                MessageBox.Show(validator.LastErrorMessage, "Validator error",  MessageBoxButtons.OK, MessageBoxIcon.Error); 
            }
        }