replace existing file with old file in asp.net using c#

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Replace the existing file with old file in asp.net using c#.

My code as follows;

string filepath = Application.StartupPath + "\\Preseaintake\\newtest.xls";
string filepath1 = Application.StartupPath + "\\Preseaintake\\test.xls";
string filepath2 = Application.StartupPath + "\\Preseaintake\\backup.xls";

if (System.IO.File.Exists(filepath))
File.Replace(filepath1, filepath, filepath2);

xlWorkBook.SaveAs(filepath1, misvalue, misvalue, misvalue, misvalue, misvalue, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, misvalue, misvalue,
misvalue, misvalue, misvalue);
xlWorkBook.Close(true, misvalue, misvalue);

i replacing existing file with new file.

for that i written a code above. But when i run shows error as follows;

unable to find a specified file.

The error shows in below line as follows;

File.Replace(filepath1, filepath, filepath2);

from my above code what is the mistake i madde.

please help me.

Regards,
Narasiman P.

Posted 14-Mar-14 16:46pm

Member 8054539

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Sergey Alexandrovich Kryukov 14-Mar-14 23:37pm

One of the files is not found. Check up file names.
—SA

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gggustafson · Answer 1 · 2014-03-14T18:03:00

First, rename your variables so that the names connote meaning.

Use a try-catch block to capture the exception.

The following rewrites your code. When the exception occurs, you will be provided with an indication as to what caused the error. My guess is that your source file does not exist. This in turn implies that your test for existence needs to be made against the source rather than the destination (as you have now).

C#

string destination_filename = Application.StartupPath + "\\Preseaintake\\newtest.xls";
string source_filename = Application.StartupPath + "\\Preseaintake\\test.xls";
string backup_filename = Application.StartupPath + "\\Preseaintake\\backup.xls";

try
    {
    if ( File.Exists ( destination_filename ) )
        {
        File.Replace( source_filename, 
                      destination_filename, 
                      backup_filename );
        MessageBox.Show ( "Replaced" );
        }
    }
catch ( Exception ex )
    {
    MessageBox.Show ( ex.Message +
                      Environment.NewLine +
                      ex.StackTrace );
    }