From Measuring Performance

Assets/TextMesh Pro/Examples & Extras/Scripts/DropdownSample.cs

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+using TMPro;
+using UnityEngine;
+
+public class DropdownSample: MonoBehaviour
+{
+	[SerializeField]
+	private TextMeshProUGUI text = null;
+
+	[SerializeField]
+	private TMP_Dropdown dropdownWithoutPlaceholder = null;
+
+	[SerializeField]
+	private TMP_Dropdown dropdownWithPlaceholder = null;
+
+	public void OnButtonClick()
+	{
+		text.text = dropdownWithPlaceholder.value > -1 ? "Selected values:\n" + dropdownWithoutPlaceholder.value + " - " + dropdownWithPlaceholder.value : "Error: Please make a selection";
+	}
+}