Select di Grid using x++

Select di Grid using x++ :

public boolean modified()

{

    boolean ret;

    UserGroupId groupName;

   IPMS_BusinessArea   tblBA, activeRow;

    Common      common;

    int aaa;

    ret = super();

    groupName = this.valueStr();

    select tblBA where tblBA.UserGroupId == groupName;

    if(tblBA && groupName != "")

    {

        warning("Group name is already used.");

        common = IPMS_BusinessArea_ds.cursor();

      activeRow = common;

      activeRow.UserGroupId = "";

        IPMS_BusinessArea_ds.research(true);

    }

    return ret;

}