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c# – FileNotFound exception when trying to move a file with File.Move

Posted by: admin April 23, 2020 Leave a comment


I have a folder with over 2000+ MS Excel 2010 .XLSX spreadsheets and I need to perform the following actions:

  • I need to open each individual file

  • Copy the content of cell B4 (+ each file has unique content on cell B4), and

  • append the content of cell B4 to the original file name

How can I fix this error so I can successfully rename my spreadsheets as mentioned above?

//file rename code
DirectoryInfo d = new DirectoryInfo(@"C:\Torename\");
FileInfo[] infos = d.GetFiles();
foreach (FileInfo f in infos)

    Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();

    Workbook wb = excel.Workbooks.Open(f.FullName);
    Worksheet excelSheet = wb.ActiveSheet;

    //Read the first cell
    string test = excelSheet.Cells[4, 2].Value.ToString();

    File.Move(f.Name, new_filename);

    ***Thank you for your assistance that did the trick
How to&Answers:

File.Move(f.FullName, new_filename);

You have to use FullName, you need the full path.

Edit: Not part of your Question, but:

I’m not sure how Workbooks.Open works, but if you run into errors you might close the file before renaming it.

Also Adams comment.


Close the workbook before moving it. Make sure to release all the resources associated with that file.
And make sure you use the whole path in the names