private void OnButtonClick(object sender, EventArgs e) { switch (((Button)sender).Name) { case "btnTest": TestExpression(); break; case "btnClear": textQuery.Clear(); break; case "btnShowValues": break; case "btnCancel": Close(); break; case "btnOk": if (TestExpression()) { _layersHandler.VisibilityExpression(textQuery.Text, ExpressionTarget); Close(); } break; } }