CrystalReport.NET exporting to Excel Problem

[Mustufa Baig]

I have an ASP.NET website where I am showing off crystal reports to users by
exporting them to pdf format. Following is the code:
----------------
1 Private Sub ExportReport()
2 Dim oStream As System.IO.MemoryStream =
3 myReport.ExportToStream(
ExportFormatType.PortableDocFormat)

4 Response.Clear()
5 Response.Buffer() = True
6 Response.ContentType = "application/pdf"
7 Try
8 Response.BinaryWrite(oStream.ToArray())
9 Catch err As Exception
10 Response.Write("< BR >")
11 Response.Write(err.Message.ToString)
12 End Try
13 oStream.Close()
14 Response.End()
15 End Sub
-----------------------
This code working absolutely fine. But if I want to export the reports to
EXCEL format then I just need to change lines 3 and 6:

3 ==> myReport.ExportToStream(
ExportFormatType.Excel)

6 ==> Response.ContentType = "application/vnd.ms-excel"

After the above alterations the should work fine but it doesn't. I even
tried to export to MS Word but it didn't work as well. Following is the
explaination what actually happening:

So after user clicks View Report, what happening is the excel application
opens in the browser but showing no report just saying : "You are curently
not logged in.
Please Log in first!". This is kind of weird to me because this message only
comes when somebody tries to access my website's any page without Logging
In. So to find out whats going wrong I put a break point at Page_Init
procedure. So I step through each line and just after executing
Response.End() statement I found that the page loads itself and as result of
that it breaks again at Page_Init procedure. But as I am checking at the
begining whether user is logged in or not and apparently when this page gets
executed 2nd time, it doesn't have any session information thus resulting
"You are curently not logged in. Please Log in first!" message but displays
in the excel application opened in the browser. One more thing I also
observed that whenever I clicked to get the report, I always see a small
window appearing for very short period of time at the top left corner with a
progress bar stating "Transfering...
http://localhost/webreadfile/report.aspx". I really don't know whats causing
this twice execution because it only happens when I try to export cystal
report to some MS Office format such as MS Excel.

I also tried to put trace on and there I also confirmed it that this page is
getting executed twice in case of exporting to Excel format. Exporting to
PDF works perfect.

I would really really appreciate your help.

thanks.

[Elton W]

Hi Mustufa,

I suppose you are using Office 2000 in client-side. I think there is a bug
in Office 2000 that causes IE cannot show Excel (or Word) file properly. In
my experience, you use 'attachment' to get exported office file:

Private Sub ExportReport()
Dim oStream As System.IO.MemoryStream =
myReport.ExportToStream(
ExportFormatType.Excel)
Response.Clear()
Response.AddHeader("content-disposition", "attachment;
filename="exported.xls");
Response.Buffer() = True
Response.ContentType = application/vnd.ms-excel"
Try
Response.BinaryWrite(oStream.ToArray())
Catch err As Exception
Response.Write("< BR >")
Response.Write(err.Message.ToString)
End Try
oStream.Close()
Response.End()
End Sub

HTH

Elton Wang

"Mustufa Baig" wrote:

I have an ASP.NET website where I am showing off crystal reports to users by
exporting them to pdf format. Following is the code:
----------------
1 Private Sub ExportReport()
2 Dim oStream As System.IO.MemoryStream =
3 myReport.ExportToStream(
ExportFormatType.PortableDocFormat)

4 Response.Clear()
5 Response.Buffer() = True
6 Response.ContentType = "application/pdf"
7 Try
8 Response.BinaryWrite(oStream.ToArray())
9 Catch err As Exception
10 Response.Write("< BR >")
11 Response.Write(err.Message.ToString)
12 End Try
13 oStream.Close()
14 Response.End()
15 End Sub
-----------------------
This code working absolutely fine. But if I want to export the reports to
EXCEL format then I just need to change lines 3 and 6:

3 ==> myReport.ExportToStream(
ExportFormatType.Excel)

6 ==> Response.ContentType = "application/vnd.ms-excel"

After the above alterations the should work fine but it doesn't. I even
tried to export to MS Word but it didn't work as well. Following is the
explaination what actually happening:

So after user clicks View Report, what happening is the excel application
opens in the browser but showing no report just saying : "You are curently
not logged in.
Please Log in first!". This is kind of weird to me because this message only
comes when somebody tries to access my website's any page without Logging
In. So to find out whats going wrong I put a break point at Page_Init
procedure. So I step through each line and just after executing
Response.End() statement I found that the page loads itself and as result of
that it breaks again at Page_Init procedure. But as I am checking at the
begining whether user is logged in or not and apparently when this page gets
executed 2nd time, it doesn't have any session information thus resulting
"You are curently not logged in. Please Log in first!" message but displays
in the excel application opened in the browser. One more thing I also
observed that whenever I clicked to get the report, I always see a small
window appearing for very short period of time at the top left corner with a
progress bar stating "Transfering...
http://localhost/webreadfile/report.aspx". I really don't know whats causing
this twice execution because it only happens when I try to export cystal
report to some MS Office format such as MS Excel.

I also tried to put trace on and there I also confirmed it that this page is
getting executed twice in case of exporting to Excel format. Exporting to
PDF works perfect.

I would really really appreciate your help.

thanks.