Retrieve Multiple Records in D365

Hi friends,

            How can retrieve multiple records on button clicked method from grid in AX7.

While i am using the code like

"

InventItemGroup itemGroup;

itemGroup = InventItemGroup_DS.getFirst(1);
while (itemGroup.RecId != 0)
{
info(itemGroup.ItemGroupId);

itemGroup = InventItemGroup_DS.getNext();"

But i am getting in InventItemGroup_DS.  please suggest me a solution.

Thanks & regards,

padmapriya.v