Accessing USB Drives from 'Computer'

Question

I'm trying to copy files over from the desktop to a USB drive programmatically. However, when trying to run this code, I am geting an error stating that part of the path could not be found:

if (dr == DialogResult.Yes)
{
    string selected = comboBox1.GetItemText(comboBox1.SelectedItem);

    string filePath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
    string filefolder = @"\UpgradeFiles";

    string fileLocation = filePath + filefolder;

    if (!Directory.Exists(fileLocation))
    {
        Directory.CreateDirectory(fileLocation);
    }

    else if (Directory.Exists(fileLocation))
    {
        DirectoryInfo di = new DirectoryInfo(fileLocation);

        FileInfo[] fileList = di.GetFiles();
        foreach (FileInfo file in fileList)
        {
            string DrivePath = Environment.GetFolderPath(
                Environment.SpecialFolder.MyComputer);
            string CopyToDrive = comboBox1.Text;

            file.CopyTo(DrivePath + CopyToDrive, false);
        }
    }
}

The combobox contains the selected drive letter. Am I approaching this wrong when trying to add "computer\driveletter"?

Answer 1

Your File.CopyTo(DrivePath + CopyToDrive, false) should be:

File.CopyTo(CopyToDrive + File.Name, false);

but with a bit of syntactic sugar like using Path.Combine or String.Format instead of just "+".

The issue is that File.CopyTo requires both the directory AND filename of the end location, when you're just providing the directory. This can be seen in the documentation for the method call here: https://msdn.microsoft.com/en-us/library/f0e105zt(v=vs.110).aspx