writing values to an excel sheet

Hi,

you can do it easily with this Excel .NET library.

See code snippet:

ExcelFile ef =  new  ExcelFile();

// Adds new worksheet to excelFile.
ExcelWorksheet ws = ef.Worksheets.Add("New worksheet");

// Sets the value of the cell "A1".
ws.Cells["A1"].Value = "Hello world!";

// Saves the excel file.
ef.SaveXls("excelFile.xls");

You can use the Office interop libraries: References - Add Reference - Microsoft.Office.Interop.Excel
Now you can do something like this:
 
using Excel = Microsoft.Office.Interop.Excel;
.
.
.
object missing = Type.Missing;
Excel.Application app = new Microsoft.Office.Interop.Excel.Application();
app.Visible = false;
Excel.Workbook wb = app.Workbooks.Add(missing);
Excel.Worksheet sheet = (Excel.Worksheet)wb.Worksheets[1];
sheet.Cells[1, 1] = textBox1.Text;
// display application
app.Visible = true;
// save workbook
//wb.SaveAs(@"c:\temp\temp.xlsx", missing, missing, missing, missing, missing,
// Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlShared, missing, missing, missing, missing, missing);
//wb.Close();
//app.Quit();