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//自动完成下拉框
DataTable dt = new DataTable();
dt.Columns.Add("Name");
dt.Columns.Add("VV");
dt.Rows.Add(new string[] { "aa", "x" });
dt.Rows.Add(new string[] { "bb", "z" });
dt.Rows.Add(new string[] { "cc", "y" });
dt.Rows.Add(new string[] { "dd", "w" });
this.comboBox1.DataSource = dt;
this.comboBox1.DisplayMember = "Name";
this.comboBox1.ValueMember = "VV";
this.comboBox1.AutoCompleteSource = AutoCompleteSource.ListItems;
this.comboBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;