private void btnDraw_Click(object sender, EventArgs e) { string[] filter = null; if (txtFilter.Text.Length > 0) { filter = txtFilter.Text.Split(';'); } Extender.Build( this.data, filter, (cmbS.SelectedItem as ListItem).Value as PropertyInfo, (cmbX.SelectedItem as ListItem).Value as PropertyInfo, (cmbY.SelectedItem as ListItem).Value as PropertyInfo, this.chcChart, (System.Windows.Forms.DataVisualization.Charting.SeriesChartType)cmbChartType.SelectedItem); }