Sub Page_Load(ByVal Sender As Object, ByVal E As EventArgs)
Dim mynull As DBNull
Response.Write(Message(mynull))
End Sub
Function Message(ByVal name As String) As String
Return name
End Function运行出错：类型“System.DBNull”的值无法转换为“String”！
以前在ASP中也存在着类似的问题，解决方法很简单：将null值和""(空字符串)先进行连接一下再对它进行操作！同样的思路：
Sub Page_Load(ByVal Sender As Object, ByVal E As EventArgs)
Dim mynull As DBNull
Response.Write(Message(mynull+""))
End Sub
Function Message(ByVal name As String) As String
Return name
End Function问题解决！
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