How to var variables convert to datatable in C#?

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C#

LINQ

I have two variables how can I get it as datatable and return it with foreach.
I want to keep linq query in datatable

linq querys:

var table1=from p in tableA.... etc

var table2=from p in tableB... etc

var except=table1.Except(table2);

I want to var variable get var variables datatable and return with foreach.

What I have tried:

var table1=from p in tableA.... etc

var table2=from p in tableB... etc

var except=table1.Except(table2);

I want to foreach but var variable define.So Datatable not write.

foreach( DataTable dt in except)
{
  Student st=new Student();
  st.Add(dt);
}