C# Excelのプロパティ>ユーザ設定を扱う方法

    private static void MosaMosaAA() {
        Excel.Application xlApplication = null;

        try {
            xlApplication = new Excel.Application();
            xlApplication.Visible = true;
            Excel.Workbooks xlWorkbooks = null;

            try {
                xlWorkbooks = xlApplication.Workbooks;
                Excel.Workbook xlWorkbook = null;

                try {
                    xlWorkbook = xlWorkbooks.Open (
                        @"C:\MakiMakiLove.xls",
                        System.Reflection.Missing.Value, System.Reflection.Missing.Value,
                        System.Reflection.Missing.Value, System.Reflection.Missing.Value,
                        System.Reflection.Missing.Value, System.Reflection.Missing.Value,
                        System.Reflection.Missing.Value, System.Reflection.Missing.Value,
                        System.Reflection.Missing.Value, System.Reflection.Missing.Value,
                        System.Reflection.Missing.Value, System.Reflection.Missing.Value,
                        System.Reflection.Missing.Value, System.Reflection.Missing.Value
                    );
                    object xlDocumentProperties = null;

                    try {
                        xlDocumentProperties = xlWorkbook.CustomDocumentProperties;
                        System.Type typeDocumentProperties = xlDocumentProperties.GetType();
                        object xlDocumentProperty = null;

                        try {
                            xlDocumentProperty = typeDocumentProperties.InvokeMember(
                                "Item",
                                System.Reflection.BindingFlags.GetProperty,
                                null,
                                xlDocumentProperties,
                                new object[] {"タイピスト"}
                            );

                            if (xlDocumentProperty == null) {
                                return;
                            }

                            System.Type typeDocumentProperty = xlDocumentProperty.GetType();
                            object propertyValue = typeDocumentProperty.InvokeMember(
                                "Value",
                                System.Reflection.BindingFlags.GetProperty,
                                null,
                                xlDocumentProperty,
                                null
                            );

                            if (propertyValue != null) {
                                MessageBox.Show("タイピストの値 == " + propertyValue.ToString());
                            }
                        } finally {
                            if (xlDocumentProperty != null) {
                                System.Runtime.InteropServices.Marshal.ReleaseComObject(xlDocumentProperty);
                            }
                        }
                    } finally {
                        if (xlDocumentProperties != null) {
                            System.Runtime.InteropServices.Marshal.ReleaseComObject(xlDocumentProperties);
                        }
                    }
                } finally {
                    if (xlWorkbook != null) {
                        try {
                            xlWorkbook.Close(
                                System.Reflection.Missing.Value,
                                System.Reflection.Missing.Value,
                                System.Reflection.Missing.Value
                            );
                        } finally {
                            System.Runtime.InteropServices.Marshal.ReleaseComObject(xlWorkbook);
                        }
                    }
                }
            } finally {
                if (xlWorkbooks != null) {
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(xlWorkbooks);
                }
            }
        } finally {
            if (xlApplication != null) {
                try {
                    xlApplication.Quit();
                } finally {
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApplication);
                }
            }
        }
    }