Export to Excel from a Datatable using EEPlus doesn't work

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Hello Experts,

As per the comments given by Richard Deeming. I tried to use EEplus for exporting data to Excel.
Here is my code

Dim file As FileInfo = New FileInfo("ClaimForms_")
           Using pck As New ExcelPackage(file)
               Dim ws As ExcelWorksheet = pck.Workbook.Worksheets.Add("Sheet3")
               Dim dsExcel As DataSet = dbnet.GetAllDetails()
               Dim dt As DataTable = dsExcel.Tables(0)

               ws.Cells("A1").LoadFromDataTable(dt, True)
               ws.Cells.AutoFitColumns()
               Using rng As ExcelRange = ws.Cells(1, 1, 1, dt.Columns.Count)
                   rng.Style.Font.Bold = True
                   rng.Style.Fill.PatternType = ExcelFillStyle.Solid
                   rng.Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.FromArgb(79, 129, 189))
                   rng.Style.Font.Color.SetColor(System.Drawing.Color.White)
               End Using
               pck.Save()

               Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
               Dim fileName As String = String.Format("ClaimReport_{0:yyyyMMdd_HH_mm}.xlsx", DateTime.Now)
               Dim disposition As String = String.Format("attachment; filename=""{0}""", fileName)
               Response.AppendHeader("Content-Disposition", disposition)
               Response.BinaryWrite(pck.GetAsByteArray())
               Response.TransmitFile(file.Name)
               Response.Flush()
           End Using

I get errors at the below line

Response.BinaryWrite(pck.GetAsByteArray())

saying that Part already exists. Also when I try to open the Excel. It is blank empty showing that it is corrupted

could someone help me with this please?

Posted 9-Apr-15 10:22am

sudevsu

Updated 10-Apr-15 3:51am

v3

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Richard Deeming · Accepted Answer · 2015-04-10T04:18:00

Solution 1

Remove the pck.Save() line.

You'll also need to remove the Response.TransmitFile(file.Name) line - you've already sent the file on the previous line.

Posted 10-Apr-15 4:18am

Richard Deeming

Updated 10-Apr-15 4:19am

v2

Comments

sudevsu 10-Apr-15 11:04am

I tried both didn't work. Still it saves file corrupted

sudevsu 10-Apr-15 11:32am

Thanks Richard

sudevsu · Accepted Answer · 2015-04-10T05:11:00

With reference to Richard deeming solution 1. I finally got solution
Here is my Code:

Dim file As FileInfo = New FileInfo("ClaimForms.xls")
       Using pck As New ExcelPackage(file)
           Dim wsClaims As ExcelWorksheet = pck.Workbook.Worksheets.Add("Sheet1")
           wsClaims.TabColor = Color.Blue

           Dim wslineitems As ExcelWorksheet = pck.Workbook.Worksheets.Add("Sheet2")
           wslineitems.TabColor = Color.Blue

           Dim dsExcel As DataSet = dbnet.GetAllDetails()
           Dim dtClaims As DataTable = dsExcel.Tables(0)
           Dim dtLineItems As DataTable = dsExcel.Tables(1)

           wsClaims.Cells("A1").LoadFromDataTable(dtClaims, True)
           wslineitems.Cells("A1").LoadFromDataTable(dtLineItems, True)
           wsClaims.Cells.AutoFitColumns()
           wslineitems.Cells.AutoFitColumns()
           Using rng As ExcelRange = wsClaims.Cells(1, 1, 1, dtClaims.Columns.Count)
               rng.Style.Font.Bold = True
               rng.Style.Fill.PatternType = ExcelFillStyle.Solid
               rng.Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.Blue)
               rng.Style.Font.Color.SetColor(System.Drawing.Color.Yellow)
           End Using
           Using rng As ExcelRange = wslineitems.Cells(1, 1, 1, dtLineItems.Columns.Count)
               rng.Style.Font.Bold = True
               rng.Style.Fill.PatternType = ExcelFillStyle.Solid
               rng.Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.Blue)
               rng.Style.Font.Color.SetColor(System.Drawing.Color.Yellow)
           End Using
           Dim result As MemoryStream = New MemoryStream
           pck.SaveAs(result)
           Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
           Dim fileName As String = String.Format("ClaimReport_{0:yyyyMMdd_HH_mm}.xlsx", DateTime.Now)
           Dim disposition As String = String.Format("attachment; filename=""{0}""", fileName)
           Response.AppendHeader("Content-Disposition", disposition)
           result.WriteTo(Response.OutputStream)
           'Response.BinaryWrite(pck.GetAsByteArray())
           'Response.TransmitFile(file.Name)
           ' Response.Flush()
           Response.End()
       End Using

I deleted the Excelpackage.dll which I downloaded from EEplus website. I added new dll called EEplus.dll. Everything works perfectly well.