you can do the operation using
DataRow[] dr=dt.select(//your parameters);
ex: DataRow[] dr=dt.select("AccountNO="+ your account no +" and ACCOUNTNAME ="+ your account name +"");
you can use datarow[]- it returns multiple rows..
else datarow - if returns single row.
you can databind by adding the rows to the main datatable.
foreach (DataRow dr in dr)
{
dt.ImportRow(dr);
}