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AutoCompleteStringCollection ac = new AutoCompleteStringCollection();
ac.Add("aaaaa");
ac.Add("bbbbbb");
private void button1_Click(object sender, EventArgs e)
{
textBox1.AutoCompleteSource = AutoCompleteSource.CustomSource;
textBox1.AutoCompleteMode = AutoCompleteMode.Suggest;
textBox1.AutoCompleteCustomSource =数据源 //设置数据源
}