The source contains no DataRows OR filter datatable datetime in c#

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///////// Method 1

            DataTable dt = new DataTable();

            DataTable dt2 = dt.Clone();

            var rows = dt.Select().Where(p => (Convert.ToDateTime(p["DateTime"]).Date >= System.DateTime.Now.AddDays(-50)) && (Convert.ToDateTime(p["DateTime"]) <= System.DateTime.Now.Date));

            foreach (var row in rows)

                dt2.ImportRow(row);

///////// Method 2

            DataTable dtn = new DataTable();

            dtn = dt.Clone();

            dtn = dt.Select().Where(p => (Convert.ToDateTime(p["DateTime"]).Date >= System.DateTime.Now.AddDays(-50)) && (Convert.ToDateTime(p["DateTime"]) <= System.DateTime.Now.Date)).CopyToDataTable();

 ///////// Method 3

            DataTable dt3 = new DataTable();

            dt3 = dt.Clone();

            var reRows = dt.Select().Where(m => ((DateTime)m["DateTime"]).Date >= DateTime.Now.Date);

            if (reRows.Any())

                dt3 = reRows.CopyToDataTable();