DeleteAllOnSubmit Example Linq - to - SQl

public static bool DeleteParameterMaterial(List lstParametermaterial)
{
bool result = false;
try
{
DataAccessDataContext db = new DataAccessDataContext();
foreach (ParameterMaterial pm in lstParametermaterial)
{
List temp = (from p in db.ParameterMaterials
where p.ParameterID == pm.ParameterID && p.FamilyTypeID == pm.FamilyTypeID && p.MaterialID == pm.MaterialID
select p).ToList();
//List temp = (from p in db.ParameterMaterials
// where p.ParameterMaterialID == pm.ParameterMaterialID
// select p).ToList();

if (temp.Count > 0)
{
//ParameterMaterial ParaMaterial = temp[0];
db.ParameterMaterials.DeleteAllOnSubmit(temp);
db.SubmitChanges();
result = true;
return result;
}
}

return result;
}
catch (Exception Ex)
{
ErrorHandling.ManageException(Ex, "Error on Adding Parameter Material");
result = false;
return result;
}
return true;
}