OpenTween.FilterDialog.FilterTextBox_KeyPress C# (CSharp) Method

        private void FilterTextBox_KeyPress(object sender, KeyPressEventArgs e)
        {
            TweenMain main = (TweenMain)this.Owner;
            TextBox tbox = (TextBox)sender;
            if (e.KeyChar == '@')
            {
                //if (!SettingDialog.UseAtIdSupplement) return;
                //@マーク
                main.ShowSuplDialog(tbox, main.AtIdSupl);
                e.Handled = true;
            }
            else if (e.KeyChar == '#')
            {
                //if (!SettingDialog.UseHashSupplement) return;
                main.ShowSuplDialog(tbox, main.HashSupl);
                e.Handled = true;
            }
        }