How to work with selected columns in gridview

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C#3.5

Hi Geeks,

string[] items={'56','68'};
My Gridview:

Style  56    62    68   74   80
  1    260   520   520  260  130
  2    -     130   260  520  260 

So How to add from 56 to 68 of row 1 with passing string[] items.

My code which is logically wrong..

foreach (string li in listitems)
        {
            items = li.Split('-');
                while(dtfinals.Columns[items[k]].ColumnName.ToString()!=items[items.Length-1])
                {
                    itemlists.Add(dtfinals.Columns[items[k]].ColumnName.ToString());
                    k++;
                }

I mean, I just pass the range like 56-68 but it should 56+62+68 values of row 1 and when I pass the string[] items = 74-80, it should add values from 74-80(not 56-68) of row 1 and vice versa for other rows.