search values from datatable (similer to like clause ) without using database

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C#

ASP.NET

public partial class WebForm4 : System.Web.UI.Page
    {

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!(IsPostBack))
            {
                Session["List"] = null ;
            }
        }
        public static DataTable dt;
        public static int i = 1;
       // static int i = 1;
        //static List<string> lst; 
        protected void btnAdd_Click(object sender, EventArgs e)
        {
            Session["List"] = dt;
            dt = new DataTable();
            DataRow dr = null;
          //  dt.Columns.Add(new DataColumn("RowNumber", typeof(int)));
            dt.Columns.Add(new DataColumn("Column1", typeof(string)));
          //  dt.Columns.Add(new DataColumn("Column2", typeof(string)));
          if (Session["List"] == null)
          {
              dr = dt.NewRow();
              dr["Column1"] = txtAdd.Text;
              dt.Rows.Add(dr);
          //    lst.Add(txtAdd.Text);

          }
          else if  (Session["List"] != null)
          {
              dt = (DataTable)Session["List"];
              dr = dt.NewRow();
              dr["Column1"] = txtAdd.Text;
              dt.Rows.Add(dr);
              //lst = (List<string>)Session["List"];
              //lst.Insert(i,txtAdd.Text);
              //i++;

          }
        }

        protected void btnNew_Click(object sender, EventArgs e)
        {
            List<string> lst = new List<string>();
            foreach (DataRow row in dt.Rows)
            {
                foreach (DataColumn col in dt.Columns)
                {
                    lst.Add(row[col].ToString());
                   
                }
            }
            for (int j = 0; j >= dt.Rows.Count; j++)
            {
              
            }
            bool isfound = lst.Contains(txtSearch.Text);
            Response.Write(Convert.ToString(isfound));
            dlshow.DataSource = dt;
            dlshow.DataBind();
        }
    }

i have two textboxes one to add and other is to search i want to bind only those matching values matches with search textbox ( Like ' Like ' clause ) i am not using any data base