image can't save on server when publising website

Hello friends,
I am working on a project in it I want to capture image and save it on server machine. When I run application on localhost it's work but on server site it can't.
Can any one help me...
Thank you

For converting into image I write this code...

  void CreatePhoto()   {         string strPhoto = Request.Form["imageData"]; //Get the image from flash file         byte[] photo = Convert.FromBase64String(strPhoto);          FileStream fs = new FileStream(Server.MapPath("Images/Webcam.jpg"), FileMode.OpenOrCreate, FileAccess.Write);          BinaryWriter br = new BinaryWriter(fs);         br.Write(photo);         br.Flush();         br.Close();         fs.Close();  }