查询不同的单据类型，比如关于供应商的这个有好几种单据，现在查询已经做好了，现在要实现选择不同的单据，上一次筛选的供应商值自动清空，显示现在选择的单据的供应商值，这个条件应在下面哪块写，怎么写，请教一下

Enter代码

Dim leixing,khmc,ywdw,xm,bm,gys As String

leixing = e.Form.Controls("ComboBox1").Value

khmc = e.Form.Controls("客户名称").Value

gys = e.Form.Controls("供应商").Value

ywdw = e.Form.Controls("业务单位").Value

xm = e.Form.Controls("姓名").Value

bm = e.Form.Controls("部门").Value

If leixing = "零配件采购"AndAlso gys = ""  Then

 Dim sts As List(of String) = DataTables("采购总表").SQLGetValues("供应商")

    e.Sender.Items.Clear

    For Each st As String In sts

        e.Sender.Items.Add(st)

    Next

ElseIf leixing = "其它采购"AndAlso gys = ""  Then

 Dim sts As List(of String) = DataTables("其它采购总表").SQLGetValues("供应商")

    e.Sender.Items.Clear

    For Each st As String In sts

        e.Sender.Items.Add(st)

    Next

End If

SelectedIndexChanged代码

Tables("采购总表").filter="供应商=\'" & e.Sender.SelectedValue & " \'"

Tables("其它采购总表").filter="供应商=\'" & e.Sender.SelectedValue & " \'"