public static List<NewsClass> GetAllNewsClass()
        {
            string sql = "select * from NewsClass";
            DataTable dt = DBHelper.GetDataSet(sql);
            List<NewsClass> list = new List<NewsClass>();
            foreach (DataRow dr in dt.Rows)     
            {
                NewsClass newsclass = new NewsClass();
                newsclass.NewsCId = (int)dr["NewsCId"];
                newsclass.NewsCName = dr["NewsCName"].ToString();
                list.Add(newsclass);
            }
            return list;
        }

public static List<NewsClass> GetAllNewsClass(string txtName)
        {
            string sql = "select * from NewsClass where name = txtName";
            DataTable dt = DBHelper.GetDataSet(sql);
            List<NewsClass> list = new List<NewsClass>();
            foreach (DataRow dr in dt.Rows)     
            {
                NewsClass newsclass = new NewsClass();
                newsclass.NewsCId = (int)dr["NewsCId"];
                newsclass.NewsCName = dr["NewsCName"].ToString();
                list.Add(newsclass);
            }
            return list;
        }

写个带参的方法，参数就是文本框的值

调用的时候
GetAllNewsClass(this.TxtName.text);

------解决方案--------------------
up 1l



string sql = "select * from NewsClass where name like '%"+Text.Text+"%'";
主要是这句

------解决方案--------------------
C# code

public DataSet GetList(string strWhere)
        {
            StringBuilder strSql=new StringBuilder();
            strSql.Append("select * ");
            strSql.Append(" FROM News ");
            if(strWhere.Trim()!="")
            {
                strSql.Append(" where " + strWhere + " order by id desc");
            }
            return DbHelperSQL.Query(strSql.ToString());
        }