How can we use same transaction for inserting and retriving datatable in c#?

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C#

ASP.NET

MVC3

Actually what i wan to do is ?
i wan to insert into database with transaction that is also used in getting the datatable back?
i.e i want to save data into Table Contact
I used

sqltransaction tans=null;
open.con() //to opendatabase connection
begintransaction();
_db.save('i',"2",trans);
_db.GetArea("China",trans);
public datatable GetArea(string name,sqltransaction trans)
{
  string query ="select * from Area where AreaName='"+name+"'";
  datatable dt = new datatable()
 dt= con.open.getdatatable(query,trans);
}
public datatable getdatatable(string SelectQuery,sqltransaction)
{
    SqlDataAdapter da = new SqlDataAdapter(SelectQuery, Class1.Connection);
    System.Data.DataTable dt = new System.Data.DataTable();
    //'hbug'
    try
    {
        da.Fill(dt);
        return dt;
    }
    catch
    {
        throw;
    }
}

how can i use that transaction in this getdatatable?