friend request doesnt not send

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C#

ASP.NET

SQL-Server-2008

i have to send request to user,bt this code doesnt work.
somebody plz help me to pointing me out to my mistake..
in this code at the 2nd if condition session values has change to the recenty login user..
dont knw how can be it possible..
on any user's profile page it shows the message " your own profile"..

protected void AddToFriend_Click(object sender, EventArgs e)
        {
            if (!object.Equals(Session["UserId"], null))
            {
              if (Session["UserId"].ToString() !="")
                {
                    lblError.Text = "Your own profile";
                    lblError.Visible = true;
                }
                else
                {
                    string chkfriendRequest = "SELECT * FROM Friend WHERE (myid='" + Session["UserId"].ToString() + "' and frandid='" +  Convert.ToInt32(Request.QueryString["id"])+ "') OR (myid='" +  Convert.ToInt32(Request.QueryString["id"]) + "' and frandid='" + Session["UserId"].ToString() + "')";
                    DataTable dt1 = new DataTable();
                    dt1 = dbClass.ConnectDataBaseReturnDT(chkfriendRequest);
                    if (dt1.Rows.Count > 0)
                    {
                        if (dt1.Rows[0]["FriendStatus"].ToString() == "1")
                        {
                            lblError.Text = "Already in friend list";
                            lblError.Visible = true;
                        }
                        if (dt1.Rows[0]["FriendStatus"].ToString() == "0")
                        {
                            lblError.Text = "Friend Request Pending";
                            lblError.Visible = true;
                        }
                        if (dt1.Rows[0]["FriendStatus"].ToString() == "2")
                        {
                            lblError.Text = "Friend Request deny";
                            lblError.Visible = true;
                        }
                    }
                    else
                    {
                        string friendRequest = "Insert INTO Friend (myid,frandid) VALUES('" + Session["UserId"].ToString() + "','" +  Convert.ToInt32(Request.QueryString["id"]) + "')";
                        dbClass.ConnectDataBaseToInsert(friendRequest);
                        lblError.Text = "Friend Request Send";
                        lblError.Visible = true;
                    }
                }
            }
            else
            {
                Response.Redirect("~/Login.aspx");
            }

        }