Saving data to excel file - asp.net

Question

I basically need to save the output of the stored procedure to a .xls or .xlsx Excel file. I am able to do it to a csv but not to Excel. Can someone help? Please see the code below
var result = DealingContext.PopulateUnitRebateData(true, Convert.ToDateTime("2015-01-16")).ToList();
if (result.Count > 0)
{
string header = #"""Firm ID"",""AccountNumber"",""Portfolio Name"",""Currency"",""Amount"",""Value Date""";
StringBuilder sb = new StringBuilder();
sb.AppendLine(header);
foreach (var i in result)
{
sb.AppendLine(string.Join(",",
string.Format(#"""{0}""", i.FirmID),
string.Format(#"""{0}""", i.AccountNumber),
string.Format(#"""{0}""", i.PortfolioName),
string.Format(#"""{0}""", i.Currency),
string.Format(#"""{0}""", i.Amount),
string.Format(#"""{0}""", i.ValueDate)));
}
HttpContext context = HttpContext.Current;
context.Response.Write(sb.ToString());
context.Response.ContentType = "application/vnd.ms-excel";
context.Response.AddHeader("Content-Disposition", "attachment; filename=TestData.xls");
context.Response.End();
}

Answer 1

The reason you cant save it to excel is because excel is formatted differently than csv.
The best (and easiest) library I have used for saving data to excel is LinqToExcel https://code.google.com/p/linqtoexcel/
Nuget
PM> Install-Package LinqToExcel

Answer 2

you can try to export Data to Excel using Microsoft.Office.Interop.Excel
Pass the DataSet,which has atleast one DataTable and valid fileName with Path.
public void WriteToExcel(DataSet dataSet , string fileNameWithPath)
{
Excel.Application xlApp;
Excel.Workbook xlWorkBook;
Excel.Worksheet xlWorkSheet;
object misValue = System.Reflection.Missing.Value;
xlApp = new Excel.Application();
xlWorkBook = xlApp.Workbooks.Add(misValue);
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
try
{
string data = string.Empty;
//Setting up Columns on Excel
for (int i = 0; i < 1; i++)
{
for (int j = 0; j <= dataSet.Tables[0].Columns.Count - 1; j++)
{
data = dataSet.Tables[0].Columns[j].ColumnName.ToString();
xlWorkSheet.Cells[i + 1, j + 1] = data;
}
}
//data Insertion
for (int i = 0; i <= dataSet.Tables[0].Rows.Count - 1; i++)
{
for (int j = 0; j <= dataSet.Tables[0].Columns.Count - 1; j++)
{
xlWorkSheet.Cells[i + 2, j + 1].NumberFormat = "#"; //format as text
data = result.Tables[0].Rows[i].ItemArray[j].ToString();
xlWorkSheet.Cells[i + 2, j + 1] = data;
}
}
Excel.Range range = xlWorkSheet.Range[xlWorkSheet.Cells[1, 1], xlWorkSheet.Cells[1, result.Tables[0].Columns.Count]];
range.Font.Bold = true;
range.Interior.ColorIndex = 15;
range.EntireColumn.AutoFit();
xlWorkSheet.PageSetup.LeftMargin = 0.5;
xlWorkSheet.PageSetup.RightMargin = 0.5;
xlWorkSheet.PageSetup.Zoom = false;
xlWorkSheet.PageSetup.FitToPagesWide = 1;
xlWorkSheet.PageSetup.FitToPagesTall = Math.Ceiling((result.Tables[0].Rows.Count + 1) / 50.0);
xlWorkSheet.PageSetup.Orientation = Excel.XlPageOrientation.xlLandscape;
xlWorkSheet.PageSetup.PaperSize = Excel.XlPaperSize.xlPaperLetter;
xlWorkBook.SaveAsfileNameWithPathExcel.XlFileFormat.xlOpenXMLWorkbook, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
xlWorkBook.Close(true, misValue, misValue);
xlApp.Quit();
}
catch (Exception ex)
{
}
finally
{
xlWorkSheet = null;
xlWorkBook = null;
if (xlApp != null)
{
xlApp.Quit();
}
xlApp = null;
GC.Collect();
GC.WaitForPendingFinalizers();
}
}