[Help Erorr] upload file to server with file choose from treeview

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C#

C#4.0

hey all, I want to select the items (file) which choose from treeview after that i click button upload, it file will be up to server. I get fail and erorr below:

UriFormatException was unhandle Invalid URI: The hostname could not be parsed.

Picture demo
http://i1055.photobucket.com/albums/s505/vn_photo/23.jpg[^]

Code of function upload

private void UploadFile(string filename)
{
    FileInfo fileInfo = new FileInfo(filename);
    string FileAndFolder = "ftp://" + serverIP + "/" + fileInfo.Name;
    FtpWebRequest RequestFTP;
    RequestFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + serverIP + "/" + fileInfo.Name));
    RequestFTP.Credentials = new NetworkCredential(username, passwd);
    RequestFTP.KeepAlive = false;
    RequestFTP.Method = WebRequestMethods.Ftp.UploadFile;
    RequestFTP.UseBinary = true;
    int sizedata = 1024;
    byte[] data = new byte[sizedata];
    int contlenght;
    FileStream fs = fileInfo.OpenRead();

    try
    {
        Stream strm = RequestFTP.GetRequestStream();
        contlenght = fs.Read(data, 0, sizedata);
        while (contlenght != 0)
        {
            strm.Write(data, 0, contlenght);
            contlenght = fs.Read(data, 0, sizedata);
        }
        strm.Close();
        fs.Close();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, "Upload Fail");
    }
}

Code of event click button upload

private void btnUpload_Click(object sender, EventArgs e)
{
    String fileName = trwFileExplorer.SelectedNode.ToString();
    System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo("C:\\");
    System.IO.FileInfo[] files = dir.GetFiles();
    System.Collections.ArrayList arrList = new System.Collections.ArrayList();
    foreach (System.IO.FileInfo f in files)
    {
        fileName = System.IO.Path.GetFullPath(f.Name);
    }
    MessageBox.Show(fileName);

        UploadFile(fileName);
}