Call a fuction and update colomn in datatable or gridview in C#

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C#

ASP.NET

I have a user defined fuction.when i load my datatable using a stored procedure i bind it in a grid.

I wanna take a colomn value like name and pass it to call the fuction and update the datatable with the return value.
Or
i wanna bind it to grid. Or after binding to a grid can i call the function thenupdate the grid view help.
Datatable in side foreach loop setfeild and feild property not working. Need code in c# asp.net

What I have tried:

Foreach datarow dr in dt.rows
String str = dr.feild<string> (uname);
Str1 = loadname(str);
Dr.setfeild<string>(uname,str)
Dt.acceptchanges();