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我在我的winform中有一个文本框。我想用客户表中的手机号码自动填充它。我已经编写了代码，但没有自动完成。自动完成文本框
string CS = "data source=.; database=BillingSoftware; user id=sa; Password=9495640";
SqlConnection con = new SqlConnection(CS);
con.Open();
SqlCommand cmd = new SqlCommand("SELECT Phone FROM Customers", con);
SqlDataReader rdr = cmd.ExecuteReader();
AutoCompleteStringCollection CustomerPhone = new AutoCompleteStringCollection();
while (rdr.Read())
{
CustomerPhone.Add(rdr.GetString(0));
}
txt_customerPOS.AutoCompleteCustomSource = CustomerPhone;
con.Close();