Display Method in AX2012

1. Create Two Tables  with fields (Customername, Itemname, Amount - Table1,Customername, Name ,Qty - Table2 ) 

2.After  that create a form with datasource

3.Add the fields in  design node.

4.Create  a new method in table you want to display(i.e Display  the  itemname in the name field of Table2)

Display ItemName Test()
{
    Display2 display2;
    Display1 display1;
    //ItemName name;
 select display2 where display2.CustomerName== this.CustomerName;
 return display2.ItemName;
}

5.Now go to Form -> Design Node-> Name field  properties  DATASOURCE  as Table2 & DATA METHOD  as Test() method name

6.Now you can see the output  i am getting the Item name in my Name field