Export data from sharepoint silverlight text controls to existing Excel sheet template.

String FILE_FILTER = "Excel Files(*.xls)|*.xls";
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.Filter = FILE_FILTER;
if (openFileDialog.ShowDialog() == true)
{
System.IO.FileStream fileStream = openFileDialog.File.OpenRead();
byte[] textBytes = new byte[fileStream.Length];
fileStream.Read(textBytes, 0, textBytes.Length);
Workbook workbook = Workbook.Open(fileStream);
Worksheet worksheet = workbook.Worksheets[0];
worksheet.Cells[0, 0].Value = ("Datum");
worksheet.Cells[0, 1].Value = ("Avdelning");
worksheet.Cells[0, 2].Value = ("Allvarlighetsgraden");
worksheet.Cells[0, 3].Value = ("Raport");
workbook.Worksheets.Add(worksheet);
workbook.Save(fileStream);
}

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