Select multiple records from lookups in Dynamics AX 2012

http://soft-maya.blogspot.in/2012/11/select-multiple-records-from-lookups-in.html

Retrieve multiple selected records from Grid using X++. in AX dynamics 2012

Retrieve all selected records of a datasource in a Grid

    int             recordsCount;

    Student     studentLocal;

    super();

    

    recordsCount = student_ds.recordsMarked().lastIndex();  // Total no of marked records.

    studentLocal = student_ds.getFirst(1);

    

    while (studentLocal)

    {

        info(studentLocal.Name +" " +studentLocal.ID);

        studentLocal = student_ds.getNext();

    }

How to set null value in reference control on a Form

ABCTable _ds.object(fieldNum(ABCTable, Field1)).setValue(0);

ABC_ds.rereadReferenceDataSources();

Or

ABCTable _ds.object.Field1 = 0;

ABC_ds.rereadReferenceDataSources();