The process cannot access the file 'xxx' because it is being used by another process

Hello everyone,

I did a search and found another post that was similar but not quite the same as my problem.  I have an SSIS package I'm trying to build that will look in a source directory for a file, check to see if it's locked, and if it isn't, moves it to another directory.  Here's my issue:

I have a C# script task that attempts to open the source file to check if it's locked...

        public void Main()
        {
            // Declare local variables
            String strFileName = Convert.ToString(Dts.Variables["FileName"].Value);
            FileStream fsMyFile;

            try
            {
                // Attempt to open file to check if it's locked by another process.  
                // If able to open, it is unlocked and can be passed to the next task
                fsMyFile = File.Open(strFileName, FileMode.Open, FileAccess.ReadWrite,FileShare.None);
                Dts.TaskResult = (int)ScriptResults.Success;
            }
            catch(Exception e)
            {
                // Attempt to open file failed, leave file for next job run
                Dts.TaskResult = (int)ScriptResults.Failure;
                throw e;
            }
           
        }

The problem in the next task, after successfully determining that the file is able to be opened, I use a file system task to move the file to the target directory but run into the error message: "The process cannot access the file 'xxxx' because it is being used by another process.  I've tried several things already including having the thread sleep for a few seconds before the file system task but nothing works.  Has anyone else run into a problem like this?  I'm trying to avoid delay tactics as I'm attempting to move multiple files within a pre-determined length of time.

Thanks in Advance,
Glen