具有建议功能的ComboBox基于子串搜索或combox列表项中的文本匹配

Question

这就是我从大量数据库中填充组合框的方法。 我如何从组合框中的列表项搜索，因为建议不从头开始搜索也找到字符串内部的子字符串。并在建议的组合框列表中显示所有匹配的结果

{
    SqlConnection connection = DBConnectivity.getConnection();
    SqlCommand command;
    string query;
    DataSet dataset;
    DataTable datatable;
    SqlDataAdapter adapter;
    SqlDataReader reader;
    string[] ProductNameList;

    public productform()
    {
        InitializeComponent();


    }

    //------------Form load Events and functions-----------------------------
    DataSet dataset2 = new DataSet();  
    ClassesAll.PartyandProductClass PartyandProducts = new ClassesAll.PartyandProductClass();
    private void productform_Load(object sender, EventArgs e)
    {

        try
        {
            // events for loading partytype broker on load

            string query2 = "SELECT productNameUR, id FROM product";
            SqlCommand command2 = DBConnectivity.getCommandForQuery(query2, connection);

            SqlDataAdapter adapter2 = new SqlDataAdapter(command2);
            adapter2.Fill(dataset2);
            int result = command2.ExecuteNonQuery();
            this.cBjins.DisplayMember = "productNameUR";
            this.cBjins.ValueMember = "id";

            DataRow datarow1 = dataset2.Tables[0].NewRow(); 
            datarow1["productNameUR"] = "Select Product";
            dataset2.Tables[0].Rows.InsertAt(datarow1, 0);
            this.cBjins.DataSource = dataset2.Tables[0];


        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }

建议我一个解决方案。