c# - Exporting excel error : File you are trying to open FileName is in different format than specified extension -

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I used the following code to export data from a dataset to file excel: 

  Public Zero ExportRecords (System.Data.DataTable dt, string filename) {try {if (dt.Rows.Count> 0) {string path = AllinAudio_Temp; String Timestamp = Convert. Toasting (datetime.now); Timestamp = timestamp. Change ("", ""); Timestamp = timestamp. Change ("/", ""); Timestamp = timestamp Change (":", ""); FileName = fileName.Replace ("", ""); String filename = path + @ "\" + timestamp + "_" + filename + ".xls"; CarlosAge.XXLXMLR Workbook Book = New CarlosAge.XXLXMLR Workbook (); //// Add a worksheet with some data to CarlosAge.excelAclaimware. Worksheet sheet = book. Worksheets. Add ("Sheet1"); Worksheet style style = book. Style. Add ("Header Sky"); Style Font Bold = true; Worksheet style style = 1 book. Style. Add ("Headersitter 1"); style1.Font.Bold = True; Style1.Font.Color = "Red"; Worksheet line row; // sheet = Table. Add (); Line = sheet.ttable.day. Add (); Foreach (DataColumn column in dt.Column) {row.Cells.Add (new worksheet cell (column.ColumnName, "HeaderStyle")); } (Int i = 0; i & lt; dt.rows.Count; i ++) {line = sheet} Tables.Rows.Add (); For (int l = 0; l   
 When the file is exported and we try to open it, then the message gives me:  
  Enter image details here   
 I want the file only in xls format and I am also exxporting it in XML format.  
 But  
  When I tried with XLSX   
  Enter the image details    
 
 
 The biggest gesture component The code that is being used to create  ExcelXmlWriter  appears to be written in Excel XML format, in which the file extension should be  XML  when you type the  XLS  If you use extensions, then excel the content Sector is expected to be in nature. When it fails to open the file as a classic excel file, then that option tries to find that excel XML works and warns you of the problem.  
 Solution: To use the file extension, change your output code instead of  XML  instead of  XLS   
 (as previously mentioned in XLSX Is not.)

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