I have a code like this,
DataTable dt = new DataTable(); string data = \"{\\\"ProductId\\\":[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,
Your json must be an array of objects to be converted to a DataTable, it must start like this :
"[{\"ProductId\..........
end ends like this:
....,\"fieldName\":Value}]"