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when evere i am generating a excel sheet i am getting error

"the file you are trying to open ,"RiskReport.xls" ,is in a different Format than soecified by the file extention. verify that file is not corrupted and is from a trusted source befor opening the file. Do you want to open the file now. "

if i am cliking on YES then only file is open without data if "no" then alll file is open successfully.

byte[] data = new System.Text.ASCIIEncoding().GetBytes(theWorkbook.ToString());

if (format == "Excel")
                        Byte[] fileContent = manager.GetRiskReportByte(format, orgRecNos, noPendingProposals, isPendingProposals, isDisapprovedProposals, dateFrom, dateTo, minRiskScore, maxRiskScore, dataOnlyValue, riskScoreRecNos, isUnassessed, orderByParam, orderByFlow, isAllRisk);
                        const string fileName = "RiskReportxl" + ".xls";
                            response.ContentType = "application/xls";
                            response.AddHeader("content-disposition", "attachment; filename=" + fileName);


[edit]SHOUTING removed, overenthusiastic HTML encode fixed - OriginalGriff[/edit]
Updated 7-Jul-13 21:37pm
OriginalGriff 8-Jul-13 3:37am
DON'T SHOUT. Using all capitals is considered shouting on the internet, and rude (using all lower case is considered childish). Use proper capitalisation if you want to be taken seriously.
siddharth629 8-Jul-13 4:29am
OriginalGriff 8-Jul-13 4:35am
Maciej Los 8-Jul-13 4:55am
Check the file name! You want to open RiskReport.xls, but in code you are trying to open RiskReportxl.xls. Do you see the difference?
siddharth629 8-Jul-13 5:24am
thaks sir.
but is does not working same error is appear. when ever i am usng /*theWorkbook.SaveCopyAs(fileName);
theWorkbook.Close(false, fileName, true);
byte[] data = ExportImportUtil.StreamFile(fileName);

instead of byte[] data = new System.Text.ASCIIEncoding().GetBytes(theWorkbook.ToString());

then there is no error .

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