VB FOR 循环语句

VB FOR 循环语句
Dim i,j,c As Integer
Dim a,b As String
c = 0
Adodc1.RecordSource = " select * from inf where 下单时间 between #" & DTP1.Value & "# and #" & DTP2.Value & "# "
Adodc1.Refresh
For j = 0 To Combo1.ListCount - 1
b = Combo1.List(j)
For i = 0 To Adodc1.Recordset.RecordCount - 1
a = Adodc1.Recordset.Fields(15).Value
If b = a Then
c = 1 + c
End If
Next i
Text8.Text = Combo1.List(j) + "共" + Str(c) + "记录"
Next j
这里面有一个COMBOBOX控件里面有几个省份的名称（不重复）,一个表中的字段（也就是Fields(15)）也有省份名称（有重复）,现在想统计 这段时间内 表中字段（Fields(15)中）几个省份的名称,结果显示在Text8.text里!如：河南共8条记录,内蒙共3条记录,河南共9条记录……