private void button1_Click(object sender, EventArgs e)
        {
            if (txt_username.Text == "")
            {
                errorlabelUsernme.Visible = true;
            }
            else
            {
                errorlabelUsernme.Visible = false;
            }
            if (txt_password.Text == "")
            {
                errorlabelpassword.Visible = true;
            }
            else
            {
                errorlabelpassword.Visible = false;
            }

            if (errorlabelpassword.Visible || errorlabelUsernme.Visible)
            {
                Mainclass.ShowMsg("Field with * are mandatory", "Error...", "Error..");
            }
            else
            {
                if (mai.getStaffLogin(txt_username.Text, txt_password.Text))
                {
                    if (Mainclass.STAFFROLE == "Falculty")
                    {
                        FalcultyDashboard hs = new FalcultyDashboard();
                        Mainclass.showWindow(hs, this, Mdi.ActiveForm);
                    }

                    if (Mainclass.STAFFROLE == "Admin")
                    {
                        Home hs = new Home();
                        Mainclass.showWindow(hs, this, Mdi.ActiveForm);
                    }
                    if (Mainclass.STAFFROLE == "Teacher")
                    {
                    }
                    if (Mainclass.STAFFROLE == "Principal")
                    {
                    }
                }

                else
                {
                    Mainclass.ShowMsg("Invalid Login Details", "Error...", "Error..");
                }
            }
        }