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DataTable dt = new DataTable(); dt.Columns.Add("ID", typeof(String)); dt.Rows.Add("USB22345"); dt.Rows.Add("USC33399"); dt.Rows.Add("USD66777"); var query = from c in dt.AsEnumerable() select c["ID"]; foreach (string item in query) Console.WriteLine(item.Select(c => char.IsDigit(c)));
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