Private Declare Function getdata Lib "sgid.dll" Alias "_GetData@4" (ByVal s As String) As Boolean//这是VB的对sgid.dll的外部引用方法；
Dim n As Long
Dim fp As Long
Dim file1 As String
Dim b As Boolean
Dim s As String * 40
List1.Clear
n = getdatanum(mm, nn)
If n > 0 Then
fp = FreeFile
file1 = Year(Date) & Format(Month(Date), "00") & Format(Day(Date), "00") + ".txt"
Open App.Path & "\" & file1 For Append As fp

aaa: b = getdata(s)
If b = False Then
GoTo endd
End If
Print #fp, s
List1.AddItem (s)
GoTo aaa
Else
If n = 0 Then
List1.AddItem ("无数据")
Else
List1.AddItem ("错误")
End If
Exit Sub
endd:
Close fp

End If//这是对VB通过调用那个动态库的函数。。。。。。。
现在问题是，我C#写该怎么写，各位，指点指点呀。谢谢，，给个大概或者代码，可以吗，谢谢了