返回bool并重新引发异常

是否可以在同一方法中返回bool并重新引发异常？我试过下面的代码，它一直说检测到无法访问的代码，或者我无法退出finally块。

public bool AccessToFile(string filePath)
{
    FileStream source = null;
    try
    {
        source = File.OpenRead(filePath);
        source.Close();
        return true;
    }
    catch (UnauthorizedAccessException e)
    {
        string unAuthorizedStatus = "User does not have sufficient access privileges to open the file: 'n'r" + filePath;
        unAuthorizedStatus += e.Message;
        MessageBox.Show(unAuthorizedStatus, "Error Message:");
        throw;
    }
    catch (Exception e)
    {
        string generalStatus = null;
        if (filePath == null)
        {
            generalStatus = "General error: 'n'r";
        }
        else
        {
            generalStatus = filePath + " failed. 'n'r";
            generalStatus += e.Message;
        }
        MessageBox.Show(generalStatus, "Error Message:");
        throw;
    }
    finally
    {
        if (source != null)
        {
            source.Dispose();
        }
    }
}