Kак показать клиенту файл Excel?

private void btnOk_Click(object sender, EventArgs e) 
        { 
// сдесь проверка пороля ....... 
            object missing = System.Reflection.Missing.Value; 
            object fileName = ViewDocument.ControlCollection(ExcelApp.ActiveWorkbook); 
            object newTemplate = false; 
            object docType = 0; 
            object isVisible = true; 
            ExcelApp = new Excel.ApplicationClass(); 
            ExcelApp.Visible = true; 
            objBook = ExcelApp.Workbooks.Add(missing); 
            objSheet = (Excel.Worksheet)objBook.Sheets["Sheet1"]; 
            objSheet.Name = "Client";          
            
            objSheet.get_Range("C6", Type.Missing).Value2 = "Тест"; 
}

object fileName = ViewDocument.ControlCollection(ExcelApp.ActiveWorkbook);

sheet = (Excel.Worksheet)m_Workbook.Sheets["Sheet1"];
            //objSheet.Name = "Client";
            sheet.get_Range("B19", Type.Missing).Value2 = "Test";

sheet = (Excel.Worksheet)m_Workbook.Sheets["Sheet1"];

public Worksheet FindExcelWorksheet(string sheetname)
        {
            if (m_Workbook.Sheets == null)  return null;
            Worksheet sheet = null;
            // Step through the worksheet collection and see if the sheet is available. If found return true;
            for (int isheet = 1; isheet <= m_Workbook.Sheets.Count; isheet++)
            {
                sheet = (Worksheet)m_Workbook.Sheets.get_Item((object)isheet);
                if (sheet.Name.Equals(sheetname)) { sheet.Activate(); return sheet; }
              
            }
            return null;            
        }

sheet.get_Range("B19", Type.Missing).Value2 = "Тест";