USB Programming with C#

You could start with something like this:

string searchFile = "searchThisFile.txt";
string searchFilePath = "";

bool found;

System.IO.DriveInfo[] drives = System.IO.DriveInfo.GetDrives();

foreach (System.IO.DriveInfo drive in drives)
{
    if (drive.DriveType == System.IO.DriveType.Removable)
    {
        if (drive.IsReady)
        {
            string[] files = System.IO.Directory.GetFiles(drive.Name);

            foreach(string file in files)
            {
                if (System.IO.Path.GetFileName(file) == searchFile)
                {
                    searchFilePath = file;
                    found = true;

                    break;
                }
            }
        }

        if(found)
        {
            break;
        }
    }
}

if(found)
{

// File found!
// The path is inside the string
// Process it

}

The code right here gets all removeable drives (USB sticks etc.) and searches for the file you want to process (searchFile). If it finds it it stops searching and store the found path inside searchFilePath.

Found will be set to true, this because otherwise it would still be searching all other drives which you don't want.

Hope this helped,
Good luck

Jordy "Kaiwa" Ruiter