c# 4.0 - How to get datatable column values in comma separated based on another column which have repeated/duplicated values? -


i need data-table column values in comma separated based on column have repeated/duplicated values. based on first column value need comma separated values of second column each unique value in first column. below current table. 

<table> <tr> <th>col1</th> <th>col2</th> </tr> <tr> <td>a</td> <td>aaa</td> <tr>   <tr> <td>a</td> <td>bbb</td> <tr>    <tr> <td>a</td> <td>ccc</td> <tr>    <tr> <td>a</td> <td>ddd</td> <tr>     <tr> <td>e</td> <td>eee</td> <tr>     <tr> <td>f</td> <td>fff</td> <tr>     </table>

expected output:

<table> <tr>     <th>col1</th>     <th>col2<th>     </tr> <tr>     <td>a</td>     <td>aaa,bbb,ccc,ddd</td>     <tr>   <tr>     <td>e</td>     <td>eee</td>     <tr>         <tr>     <td>f</td>     <td>fff</td>     <tr>     </table>

thanks in advance...


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