制作C/s安装程序的问题 - .NET技术 / C#

我的问题是：在做安装程序时，需要判断用户的电脑上是否安装了.net framework2.0这个东西，请问这段代码需要在注册表里怎么写?

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VB code:

Public Function DoesDotNETFrameworkExist(ByVal udeVersion As DotNETFrameworkVersions) As Boolean

Dim o_blnRet As Boolean
Dim o_strRet As String

With New cRegistry
.hKey = HKEY_LOCAL_MACHINE
.KeyPath = "Software\Microsoft\.NETFramework"
If .DoesKeyExist() Then
.KeyPath = "Software\Microsoft\.NETFramework"
o_strRet = GetRegValue(.GetRegistryValue("InstallRoot", ""))
o_blnRet = (o_strRet <> "")
If o_blnRet Then
With New cFileFuncs
Select Case udeVersion
Case dnfvV1
o_blnRet = .DoesFileExistEx(o_strRet & "v1.0.3705\mscorlib.dll")
Case dnfvV1_1
o_blnRet = .DoesFileExistEx(o_strRet & "v1.1.4322\mscorlib.dll")
Case dnfvVAny
o_blnRet = .DoesFileExistEx(o_strRet & "v1.0.3705\mscorlib.dll")
If o_blnRet Then
Else
o_blnRet = .DoesFileExistEx(o_strRet & "v1.1.4322\mscorlib.dll")
End If
End Select
End With
Else

End If
Else
o_blnRet = False
End If
End With

DoesDotNETFrameworkExist = o_blnRet

End Function

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安装时会自动判断啊！提示用户是否同意安装net。2.0 ！打包时将系统必备的 net2.0 选择从我程序相同的位置下载

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谢谢各位啦，我试试……
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