how to upgrade xls to xlsx to avoid the error while opening the exported excel file ?

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This is what i used to do for normal xls file format .

C#

Response.ClearHeaders();
              string attachment = "attachment; filename=EndOfYearReport.xls";
              Response.ClearContent();
              Response.AddHeader("content-disposition", attachment);
              //Response.ContentType = "application/application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
              Response.ContentType = "application/ms-excel";
              Response.Write(strEndOfYear.ToString());
              Response.End();

but while opening the file i get the error:-

"The file you are trying to open, '[filename]', is in a different format than specified by the file extension. Verify that the file is not corrupted and is from a trusted source before opening the file. Do you want to open the file now?"  (Yes | No | Help)

so tried to upgrade to new version xlsx ..

C#

Response.ClearHeaders();
               string attachment = "attachment; filename=EndOfYearReport.xlsx";
               Response.ClearContent();
               Response.AddHeader("content-disposition", attachment);
               Response.ContentType = "application/application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
               //Response.ContentType = "application/ms-excel";
               Response.Write(strEndOfYear.ToString());
               Response.End();

but not able to open the file this time ..

error was coming

Error: excel cannot open the file .xlsx because the file format or file extension is not valid

Please suggest

Posted 8-Jul-14 20:46pm

Torakami

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OriginalGriff · Answer 1 · 2014-07-08T20:54:00

Solution 1

Just changing the file name or extension doesn't mean it will work: you have to change the data format as well.

Think about it: you can put Ferrari badges on a Ford Fiesta, but that isn't going to turn it into a sports car!

You need to look at how you produce strEndOfYear and generate xlsx compatible data, as well as using the right extension.

Posted 8-Jul-14 20:54pm

OriginalGriff

Comments

Torakami 9-Jul-14 3:13am

thats true , but i am not creating any complicated data .. It just i am displying data in table

its simple <table> <tr> <td> thats it .. nothing more than that

my code is simlar to this type

strw.GetStringBuilder.Append("<table>")
strw.GetStringBuilder.Append("</table>")
strw.GetStringBuilder.Append("<table>")
strw.GetStringBuilder.Append("<tr>")
strw.GetStringBuilder.Append("<td colspan=9 align=left>")
strw.GetStringBuilder.Append("")
strw.GetStringBuilder.Append("TEST HTML Data")
strw.GetStringBuilder.Append("")
strw.GetStringBuilder.Append("</td>")
strw.GetStringBuilder.Append("</tr></table>")
strw.GetStringBuilder.Append("<br>")

Torakami 9-Jul-14 3:42am

Can any one please provide me the solution for this ..