public GroupBy GroupBy()
{
if (groupBy == null)
{
groupBy = new GroupBy(this);
}
return(groupBy);
}
public void SetGroupBy(GroupBy groupClause)
{
if (groupClause == null)
{
throw new ArgumentNullException("groupClause");
}
groupBy = groupClause;
groupBy.SetOwner(this);
}
