score:3
Something like this?
var query = (from c in dt.AsEnumerable()
select new { Value=c.Field<int>("RollNo"),
Text=c.Field<string>("Name")}).ToList();
And then just bind query to the ListBox.
UPDATE
OP wants just strings; so this should do it:
var query = (from c in dt.AsEnumerable()
select "RollNo: "+ c.Field<int>("RollNo")+ " , Name: "+ c.Field<string>("Name")).ToList();
Source: stackoverflow.com
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