如何删除数据表中的重复项，它仅包含单列？

Question

Here i upload one Notepad file in Datatable.it contains only phone numbers and doesnot contain any Headers.so i want to Remove the duplicates from My Datatable.it contains single column only. When i do this i get the result but one value will be Duplicated.

9988775566
9988556644
9966332200
9988775566

like this one value will get again.i want to get the Datatable with out Duplicates. My Snippet is

public void duplicatesinnotepad(DataTable dt, string col)
    {
        ArrayList unique = new ArrayList();
        ArrayList duplicat = new ArrayList();
        foreach (DataRow de in dt.Rows)
        {
            if (unique.Contains(de[col]))
                duplicat.Add(de);
            else
                unique.Add(de[col]);
        }
        foreach (DataRow de in duplicat)
        {
            dt.Rows.Remove(de);  
        }


    }

Answer 1

Try this

using Linq To Get Distinct Elements

        var list = (  
        from row in dt.AsEnumerable()  
        select row.Field<string>("contacts")).Distinct();

OR

    var list = dt.AsEnumerable().
    GroupBy(item => item.Field<string>(dt.Columns["contacts"]));