Posting images and text on facebook profile from asp.net

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ASP.NET

Facebook-API

Hi

I have a gridview in which there is a button on clicking it
I am posting images and text on face book when i post content on facebook with say (facebook account 1) the post is getting posted on the wall successfully
on that account
Then i log out from that account

Again i click on that button (I am signing in with my other facebook account) and trying to send content to the facebook it is not getting posted on that account it is getting posted on the previous facebook account

If i post from my first account and then if i restart my solution and then again if i sent post from different Facebook account it is getting posted sucessfully on that diffrent account

Here is my code

protected void Page_Load(object sender, EventArgs e)
        {
            try
            {
                FaceBookConnect.API_Key = ConfigurationManager.AppSettings["Fkey"].ToString();

                FaceBookConnect.API_Secret = ConfigurationManager.AppSettings["FSECRET"].ToString();


                if (!IsPostBack)
                {
                    string code = Request.QueryString["code"];//get the facebook code

                    ViewState["code"] = Request.QueryString["code"];

                    
                    #region facebook code for posting onthe wall
                    if (!string.IsNullOrEmpty(code))
                    {
                        

                        Dictionary<string, string> data = new Dictionary<string, string>();
                      
                        data.Add("link", "http://www.codeproject.com/Articles/122379/MonitorRouterIP");
                        data.Add("picture", Session["ImagePath"].ToString());
                        data.Add("caption", "");
                        data.Add("name", "");
                        data.Add("message", "test");

                        FaceBookConnect.Post(ViewState["code"].ToString(), "me/feed", data);
                        Session["File"] = null;
                        Session["Message"] = null;
                      
                      
                    }
                    #endregion
                }
            }

//And this is my grid view row command event
 Session["ImagePath"] = lnkimagepath.CommandArgument.ToString();//get the image path of the //html file
 Session["FilePath"] = lnlpath.CommandArgument.ToString();//get he filepath of the html file
                FaceBookConnect.Authorize("publish_actions", Request.Url.AbsoluteUri.Split('?')[0]);