如何在C#组合框或文本框中动态更改自动完成条目？

using System.Windows.Forms;

AutoCompleteStringCollection autoCompleteCollection = new AutoCompleteStringCollection();
autoCompleteCollection.AddRange(new string[] { "选项1", "选项2", "选项3" });

// 对于组合框
comboBox1.AutoCompleteMode = AutoCompleteMode.Suggest;
comboBox1.AutoCompleteSource = AutoCompleteSource.CustomSource;
comboBox1.AutoCompleteCustomSource = autoCompleteCollection;

// 对于文本框
textBox1.AutoCompleteMode = AutoCompleteMode.Suggest;
textBox1.AutoCompleteSource = AutoCompleteSource.CustomSource;
textBox1.AutoCompleteCustomSource = autoCompleteCollection;

autoCompleteCollection.Add("新选项");

// 对于组合框
comboBox1.AutoCompleteCustomSource = autoCompleteCollection;

// 对于文本框
textBox1.AutoCompleteCustomSource = autoCompleteCollection;