how can we upload path using C# openfile dial/folder browser

Question

i have written below code to upload path and get path name in the text box, but i am getting exception i.e occurred during a web client request..

WebClient wc = new WebClient();
Uri addy = new Uri(@"http://192...../gethos_test.php?"+fileName);
NetworkCredential nc = new NetworkCredential("name", "passowrd");
wc.Credentials = nc;
byte[] arrReturn = wc.UploadFile(addy, textBox1.Text);
wc.Dispose();
String directoryPath=Path.GetDirectoryName(fileName);
{
Uri url = ((WebBrowser)sender).Document.Url;
textBox1.Text = url.ToString();
}
MessageBox.Show(arrReturn.ToString());
}
catch(Exception E)
{
MessageBox.Show(E.Message);
}