Defines the sorting expression, it can be used to sort group instances by the aggregate function. For example: Sum(someField). Direction of the sorting specified by the GroupDef.Sorting property. If GroupDef.SortExpression is not specified then groups sorted bu the value returned GroupDef.Expression expression.

'宣言
 
Public SortExpression As System.String

'使用法
 
Dim instance As GroupDef
Dim value As System.String
 
value = instance.SortExpression
 
instance.SortExpression = value

public System.string SortExpression