根据文本框里的关键字变化，查询LISTBOX，显示包含关键字的行

第一次写东西，记录一下。
private void txt_Companykeyword_TextChanged(object sender, EventArgs e)
        {
            string KeyWord = txtBox.Text.Trim();
            bangdingshuju();//绑定数据到LISTBOX
            if (KeyWord != "" || KeyWord != null)
            {
                DataTable dt = new DataTable();
                                dt.Columns.Add("id");
                dt.Columns.Add("name");                foreach (DataRowView drv in this.listProvider.Items)
                {
                    if (drv["name"].ToString().Contains(KeyWord))
                    {
                        DataRow dr;
                        dr = dt.NewRow();
                        dr["name"] = drv["name"].ToString();
                        dr["id"] = drv["id"].ToString();
                        
                        dt.Rows.Add(dr);
                    }
                }
                this.listProvider.DataSource = dt;
                this.listProvider.DisplayMember = "name";
                this.listProvider.ValueMember = "id";
            }
            else
            {
                bangdushuju();
            }
        }