IfcDoc.CtlParameters.dataGridViewConceptRules_SelectionChanged C# (CSharp) Method

        private void dataGridViewConceptRules_SelectionChanged(object sender, EventArgs e)
        {
            if (this.m_editcon)
                return;

            //toolStripButtonTemplateInsert
            this.toolStripButtonTemplateRemove.Enabled = (this.dataGridViewConceptRules.SelectedRows.Count == 1 && this.dataGridViewConceptRules.SelectedRows[0].Index < this.dataGridViewConceptRules.Rows.Count - 1);
            this.toolStripButtonMoveDown.Enabled = (this.dataGridViewConceptRules.SelectedRows.Count == 1 && this.dataGridViewConceptRules.SelectedRows[0].Index < this.dataGridViewConceptRules.Rows.Count - 2); // exclude New row
            this.toolStripButtonMoveUp.Enabled = (this.dataGridViewConceptRules.SelectedRows.Count == 1 && this.dataGridViewConceptRules.SelectedRows[0].Index > 0 && this.dataGridViewConceptRules.SelectedRows[0].Index < this.dataGridViewConceptRules.Rows.Count - 1);
            this.toolStripButtonItemOptional.Enabled = (this.dataGridViewConceptRules.SelectedRows.Count == 1);
            if (this.dataGridViewConceptRules.SelectedRows.Count > 0 && this.dataGridViewConceptRules.SelectedRows[0].Tag is DocTemplateItem)
            {
                this.toolStripButtonItemOptional.Checked = ((DocTemplateItem)this.dataGridViewConceptRules.SelectedRows[0].Tag).Optional;
            }
            else
            {
                this.toolStripButtonItemOptional.Checked = false;
            }
        }