Creating a Form in AX 2012

Hello Everyone,

I need some help to create a form using fields from InventTable and InventTableModule. The two fields the form will use are ItemID and SalesPrice. 

This is the job to get the sales price base on the itemid passed.

static void AXListPrices(Args _args)
{
InventTable it;
InventTableModule itm;
;
while select it where it.ItemId=="100001"
join itm where it.itemid == itm.ItemId
&& itm.ModuleType == ModuleInventPurchSales::Sales
{
       info(strFmt("%1", itm.Price));
}
}

All I need to go is the following......

Create a form that allow the user to choose a item number and then the corresponding sale price will be displayed. 

Please my friends that all i want o do any help, suggestions or example would be greatly appreciated.