Try to delete a file, but SSIS think it is a path

Question

I have a process that reads file with different extension, at the end I will either move or delete the file.  Below is the code.
I can run it with success if debug locally, it failed when trying to run the package.  Below is the error:
The file received does not have extension - item_2290.seq
Error message: Access to the path 'E:\myfolder\item_2290.seq' is denied.
I tried different method and none worked, on if I delete the driectory.  I donot want to recreate the dir each time.  Please help, I am pulling my hair and no luck.
Below is the code:
foreach
(var srcfile
in
new
DirectoryInfo(SourceFilePath).GetFiles())
if (File.Exists(targetFilePath
+ srcfile.Name) == true)
srcfile.Delete();
else
File.Move(SourceFilePath + srcfile.Name, targetFilePath + srcfile.Name);
W.E. Pan

Answer 1

When you say "it failed when trying to run the package" do you mean that it failed when running from SQL Agent but that it didn't fail when running from Visual Studio?  If so, then the SQL Agent service account doesn't have permission
to move files from the folder "E:\MyFolder"  You need to give the service account permission or better yet create a proxy account. 
http://www.mssqltips.com/sqlservertip/2163/running-a-ssis-package-from-sql-server-agent-using-a-proxy-account/ 
Russel Loski, MCT, MCSE Data Platform/Business Intelligence. Twitter: @sqlmovers; blog: www.sqlmovers.com