How to select five rows from table and display in page in ASP.Net

i tried to do it dynamically iy wasnt showing anything

 public void Getgallery(string username)
    {
        // int followerid;
        //  int followingid;
        string str = ConfigurationManager.ConnectionStrings["DB"].ConnectionString;
        string getADPOST = "GetNewrecord";
        using (SqlConnection con = new SqlConnection(str))
        {
            con.Open();
            using (SqlCommand cmd = new SqlCommand(getADPOST, con))
            {
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@UserName", Session["userName"]);
                
                SqlDataAdapter da = new SqlDataAdapter(cmd);

                DataTable dt = new DataTable();
                dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id", typeof(int)),
                new DataColumn("UserName", typeof(string)),
                new DataColumn("ImageName",typeof(string)) });
               
                var result = dt.AsEnumerable().Take(5);
                DataTable ds = dt.Clone();
                foreach (DataRow dr in result)
                {
                    ds.Rows.Add(dr["Id"], dr["ImageName"]);
                }

                Repeater1.DataSource = ds;
                Repeater1.DataBind();




               
            }