ImageGlass.frmSetting.tab1_SelectedIndexChanged C# (CSharp) Method

        private void tab1_SelectedIndexChanged(object sender, EventArgs e)
        {
            lblGeneral.Tag = 0;
            lblFileAssociations.Tag = 0;
            lblLanguage.Tag = 0;

            lblGeneral.BackColor = M_COLOR_MENU_NORMAL;
            lblFileAssociations.BackColor = M_COLOR_MENU_NORMAL;
            lblLanguage.BackColor = M_COLOR_MENU_NORMAL;

            if (tab1.SelectedTab == tabGeneral)
            {
                lblGeneral.Tag = 1;
                lblGeneral.BackColor = M_COLOR_MENU_ACTIVE;

                LoadTabGeneralConfig();
            }
            else if (tab1.SelectedTab == tabFileAssociation)
            {
                lblFileAssociations.Tag = 1;
                lblFileAssociations.BackColor = M_COLOR_MENU_ACTIVE;

                txtSupportedExtensionDefault.Text = GlobalSetting.SupportedDefaultExtensions;

                foreach (var control in panExtraExts.Controls)
                {
                    var chk = (CheckBox)control;

                    chk.Checked = GlobalSetting.SupportedExtraExtensions.Contains(chk.Tag.ToString());
                }
            }
            else if (tab1.SelectedTab == tabLanguage)
            {
                lblLanguage.Tag = 1;
                lblLanguage.BackColor = M_COLOR_MENU_ACTIVE;

                lnkRefresh_LinkClicked(null, null);
            }
        }