Add Multiple table lookup in Ax 2012

1. Firstly create a View.
AOT>DataDictionary>View>Create View

2. Drag n drop Multiple tables
AOT>DataDictionary>View>Create View > sample View > dataSource> Sample Table1 > DataSource > Sample Table2

3. Drag Fileds from Both Table in Field Node.
AOT > Data Dictionary > View > sample View > Field Node > Drang n drop fileds

4. now save it.

5. Create Form.

6. In design node, create String Edit Control.

7. Write below code in lookup method of that control.

Public Void lookup()
{
Query query = new Query();
Systablelookup systablelookup;
QueryBuildDataSource Qbds;

systablelookup = Systablelookup::newParameters(tablenum(sampleView),Form_Control_name);

Qbds= query.addDataSource(tablenum(sampleView));

systablelookup.addLookupField(fieldNum(sampleView, field1));
systablelookup.addLookupField(fieldNum(sampleView, field2));
systablelookup.addLookupField(fieldNum(sampleView, field3));

systablelookup.parmquery(query);
systablelookup.performFormLookup();
}