private void btnBack1_Click(object sender, EventArgs e)
        {
            MemberOperationsForm of = new MemberOperationsForm();

            of.lblMemberName.Text = this.lblMemberName.Text;
            of.Show();    /*When we click on Button we make it go to  MemberOperationsForm*/
            this.Close(); /*After opens MemberOperationsForm, we hide CommunicationLibrarianForm*/
        }
        /*back to MemberOperationsForm*/
        private void btnBack5_Click(object sender, EventArgs e)
        {
            MemberOperationsForm of = new MemberOperationsForm();

            of.lblMemberName.Text = this.lblMemberName.Text;
            of.Show();    /*When we click on Button we make it go to  MemberOperationsForm*/
            this.Close(); /*After opens MemberOperationsForm, we hide Reser_Selfche_SelfretForm*/
        }
        /*If the librarian or member wants to log in to the library system*/
        private void btnLogin_Click(object sender, EventArgs e)
        {
            /*Is it the same as the information in the database?*/
            string userControl = "Select * from tblUser where UserName='******' And UserPassword='******' And UserStatus=1"; /*if UserStatus=1,member active*/

            DataTable _dt = DBOperations.Select(userControl);                                                                                                    /*Putting all the user's information on the DataTable*/

            if (_dt != null && _dt.Rows.Count > 0)
            {
                UserInfo.Name        = _dt.Rows[0]["Name"].ToString();
                UserInfo.SurName     = _dt.Rows[0]["Surname"].ToString();
                UserInfo.UserAddress = _dt.Rows[0]["UserAddress"].ToString();
                UserInfo.UserCaption = _dt.Rows[0]["UserCaption"].ToString();
                UserInfo.UserMail    = _dt.Rows[0]["UserMail"].ToString();
                UserInfo.UserName    = _dt.Rows[0]["UserName"].ToString();
                UserInfo.UserTC      = _dt.Rows[0]["UserTC"].ToString();


                if (_dt.Rows[0]["UserMoney"] != null)
                {
                    UserInfo.UserMoney = _dt.Rows[0]["UserMoney"].ToString();
                }
                else
                {
                    UserInfo.UserMoney = "0.00";
                }

                if (_dt.Rows[0]["UserType"].ToString() == "0")/*If the user is a member,it is UserType=0 in database*/
                {
                    UserInfo.Librarian = 0;
                    MemberOperationsForm form = new MemberOperationsForm();

                    form.Show();                                    /*When we click on Button we make it go to MemberOperationsForm*/

                    this.Hide();                                    /*After OperationForm opens, we hide LoginForm*/
                }
                else if (_dt.Rows[0]["UserType"].ToString() == "1") /*If the user is a librarian,it is UserType=1 in database*/
                {
                    UserInfo.Librarian = 1;
                    LibrarianOperationsForm form = new LibrarianOperationsForm();

                    form.Show(); /*When we click on Button we make it go to LibrarianOperationsForm*/

                    this.Hide(); /*After OperationForm opens, we hide LoginForm*/
                }
            }
            else
            {
                MessageBox.Show("Incorrect username or password!");
            }
        }