How to upload a file from client machin to server by using webservice

How to upload a file from client machin to server by using webservice

I have created webservice using C#.That take filepath/url(object from client pc ,not hosted anywhere),convert to byte array.And using that create a file on server location.Below code working fine on local machine.I uploaded file from C drive to D drive.But when I hosted service on server not localhost and trying to access,file not get uploaded and getting msg like this : Could not find file 'C:\Fileupload\test.txt'..Client can send only url of file that from local machine not hosted anywhere can not send byte array.Is there any option apart from creating new file in server.Can I directly upload like fileuploadcontrol.Client can either use web app or windows app or windows service for uploading

Here is my code :

string uploadFolder = = @"D:\UploadFiles\"; 

[WebMethod]
public string UploadFile(string filePath)
{

try
{

byte[] f = System.IO.File.ReadAllBytes(filePath);
MemoryStream ms = new MemoryStream(f);

uploadFolder = uploadFolder + StrFilename;
// StrFilename extracted from filepath

FileStream fs = new FileStream(uploadFolder, FileMode.Create);

ms.WriteTo(fs);
ms.Close();
fs.Close();
fs.Dispose();

return "OK";
}

}
catch (Exception ex)
{
// return the error message if the operation fails
return ex.Message.ToString();
}

}