private void WindowList(string username)
        {
            if (TempClass.usernameList.Contains(username))
            {
                ((SendMessage)TempClass.usernameList[username]).Focus();

            }
            else
            {

                SendMessage frmMessage = new SendMessage(username);
                frmMessage.contact = username;
                frmMessage.Text = username + " - Instant Message";
                TempClass.usernameList.Add(username, frmMessage);
                frmMessage.Show();

            }
        }
        private void tmrMessageReceive_Tick(object sender, EventArgs e)
        {
            try
            {

                string sql = "SELECT * FROM tbOnlineUsersMessage WHERE ToLoginName=@tologinname";
                SqlCommand SqlCommand1 = con.CreateCommand();
                SqlCommand1.CommandText = sql;
                int res;
                SqlCommand1.Parameters.Add("@tologinname", SqlDbType.VarChar, 100);
                SqlCommand1.Parameters[0].Value = TempClass.username;
                da = new SqlDataAdapter();
                da.SelectCommand = SqlCommand1;
                myDataSet = new System.Data.DataSet();
                res = da.Fill(myDataSet, "tbOnlineUsersMessage");

                if (res >= 1)
                {

                    string from = myDataSet.Tables["tbOnlineUsersMessage"].Rows[0]["FromLoginName"].ToString();
                    if (TempClass.usernameList.Contains(from))
                    {
                        ((SendMessage)TempClass.usernameList[from]).Focus();
                        ((SendMessage)TempClass.usernameList[from]).tmrMessageComing.Enabled = true;
                        TempClass.i = 1;

                    }
                    else
                    {

                        SendMessage frmMessage = new SendMessage(from);
                        frmMessage.contact = from;
                        frmMessage.Text = from + " - Instant Message";
                        TempClass.usernameList.Add(from, frmMessage);
                        frmMessage.Show();

                        frmMessage.tmrMessageComing.Enabled = true;
                        TempClass.i = 1;

                    }

                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error");
            }
        }