以下是一段生成“统计表”的代码，黑色部分运行正常，加了红色代码后运行出错，不知原因在哪里，请各位老师指教，谢谢！！

Dim sql As String 

Dim nd2,nd3 As WinForm.RadioButton
If dw <> "" Then ’dw 不为空时，按单位统计
    If nd2.Checked = True Then ‘按正常时间段统计
        sql = "Select 报表年月 As 年月,日期,单位,Sum(加工费) As 加工费,Sum(投工) As 月均人数 FROM {日报源表} WHERE 报表年月 >= \'" & nc & "\' And 报表年月 <= \'" & ny & "\' And 单位 = \'" & dw & "\' Group By 报表年月,日期,单位 " \'年截止月
        Dim b As New GroupTableBuilder("统计表",sql,"SCGL")
        b.Groups.AddDef("年月")
        b.Totals.AddDef("加工费")
        b.Totals.AddDef("月均人数",AggregateEnum.Average)
        b.Build()
    ElseIf nd3.Checked = True Then  \'按特殊时间段统计
        sql = "Select 报表年月 As 年月,日期,单位,Sum(加工费) As 加工费,Sum(投工) As 月均人数 FROM {日报源表} WHERE 报表年月 >= \'" & qc & "\' And 报表年月 <= \'" & ny & "\' And 单位 = \'" & dw & "\' Group By 报表年月,日期,单位 " \'年截止月
        Dim b As New GroupTableBuilder("统计表",sql,"SCGL")
        b.Groups.AddDef("年月")
        b.Totals.AddDef("加工费")
        b.Totals.AddDef("月均人数",AggregateEnum.Average)
        b.Build()
    End If
Else \'dw 为空时，按合计统计
    If nd2.Checked = True Then \'按正常时间段统计
        sql = "Select 报表年月 As 年月,日期,Sum(加工费) As 加工费,Sum(投工) As 月均人数 FROM {日报源表} WHERE 报表年月 >= \'" & nc & "\' And 报表年月 <= \'" & ny & "\' Group By 报表年月,日期" \'年截止月
        Dim b As New GroupTableBuilder("统计表",sql,"SCGL")
        b.Groups.AddDef("年月")
        b.Totals.AddDef("加工费")
        b.Totals.AddDef("月均人数",AggregateEnum.Average)
        b.Build()
    ElseIf nd3.Checked = True Then ‘按特殊时间段统计
        sql = "Select 报表年月 As 年月,日期,Sum(加工费) As 加工费,Sum(投工) As 月均人数 FROM {日报源表} WHERE 报表年月 >= \'" & qc & "\' And 报表年月 <= \'" & ny & "\' Group By 报表年月,日期" \'年截止月
        Dim b As New GroupTableBuilder("统计表",sql,"SCGL")
        b.Groups.AddDef("年月")
        b.Totals.AddDef("加工费")
        b.Totals.AddDef("月均人数",AggregateEnum.Average)
        b.Build()
    End If
End If

Dim b As New GroupTableBuilder("统计表",sql,"SCGL")

===================================================

Dim b As New SQLGroupTableBuilder("统计表1","订单")
b.ConnectionName = "Sale"

没看懂你的代码，为何不直接用Fill呢？

错误原因很清楚啊，你定义了：

Dim nd2,nd3 As WinForm.RadioButton

但是nd2和nd3没有指定值，只是定义了变量，所以下面的代码会出错：

If nd2.Checked = True Then ‘按正常时间段统计

你的加上：

Dim nd2,nd3 As WinForm.RadioButton

nd2 = e.form.Controls("控件名称")
nd3 = e.form.Controls("控件名称")

谢谢muhua和狐爸老师的指教，正如狐爸老师指出的问题，加入指定值后，问题解决，再次感谢！！