how to design a form through the code

static void createForm(Args _args)
{
    Args args;
    Form form;
    FormRun formRun;
    FormBuildDesign formBuildDesign;
    FormBuildDataSource formBuildDataSource;
    FormBuildDataSource formBuildDataSource2;
    FormBuildGridControl formBuildGridControl;
    FormDataSource formDataSource;
    DictTable dictTable;
    DictTable dictTable2;
    int idx;
    ;
    // Create the form header.
    form = new Form();

    // Add data sources to the form.
    dictTable = new DictTable(tablenum(CustTable));
    formBuildDataSource = form.addDataSource(dictTable.name());
    formBuildDataSource.table(dictTable.id());
    dictTable2 = new DictTable(78);
    formBuildDataSource2 = form.addDataSource(dictTable2.name());
    formBuildDataSource2.table(dictTable2.id());

    // Create the form design.
    formBuildDesign = form.addDesign("Design");

    // Add a grid control.
    formBuildGridControl =
 formBuildDesign.addControl(FormControlType::Grid, "Table Grid");
    formBuildGridControl.dataSource(dictTable.name());

    // Add a data field to the grid control.
    formBuildGridControl.addDataField(formBuildDataSource.id(),
    dictTable.fieldName2Id("AccountNum"));

    args = new Args();
    args.object(form);

    // Create the run-time form.
    formRun = new FormRun(Args);
    formRun.run();
    formRun.detach();

    // Return an object for the first data source,
    // and then display a query form.
    formdatasource = formRun.dataSource(1);
    formdatasource.prompt();
}