Create excel file through asp.net webservice............

Hi,

I need to generate an xl file through web service.

Basically,  
I have a dataset populated data from database and need to create a xl file on server.  All this has to be done in a web service, and I will use smtp to send this file to an email address as an attachment.

I would like to know that which library I should reference in my asp.net webservice project.  

Any code samples using xl object to create files are appreciated.

Thank You.
cm
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chandukbAsked:
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Gautham JanardhanCommented:
Excel.Application ea = new Excel.ApplicationClass();

Excel.Workbook wb = ea.Workbooks.Open(template, 0, true, 5, "", "", true,
Excel.XlPlatform.xlWindows, "", true, false, 0, true, false, false);

string currentSheet = "Daily Data";

Excel.Sheets eSheets = wb.Worksheets;
Excel.Worksheet eWs = (Excel.Worksheet)eSheets.get_Item(currentSheet);
                 
ea.Visible = true;
                 
DataTable table = ds.Tables[0];
                 
int ColumnIndex=0;
foreach(DataColumn col in table.Columns)
{
      ColumnIndex++;
      eWs.Cells[1,ColumnIndex]=col.ColumnName;
}

int count = table.Rows.Count;

int rowIndex=0;
foreach(DataRow row in table.Rows)
{
      rowIndex++;

      Console.WriteLine(count + " out of " + rowIndex);
      ColumnIndex=0;
      foreach(DataColumn col in table.Columns)
      {
            ColumnIndex++;
            eWs.Cells[rowIndex+1,ColumnIndex] = row[col.ColumnName];
      }
}

Excel.Worksheet worksheet = (Excel.Worksheet)ea.ActiveSheet;
worksheet.Activate();
}
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