System.IO.IOException错误 - 进程无法访问文件以读取...

Question

我的网站使用数据库来定位客户所在国家/地区。

这是我的错误代码：

System.IO.IOException
Inner Exception:
The process cannot access the file 'C:\*****\******\wwwroot\GEO2db\GeoLite2-Country.mmdb' because it is being used by another process.

以下是我从数据库中获取国家的代码（在我的母版页中调用）：

Public Function GetGeoIPCountry() As String
    If HttpContext.Current.Request.IsLocal Then
        Return ""
    End If
    Dim ip As String = HttpContext.Current.Request.ServerVariables("REMOTE_ADDR")
    Dim FileWithPath As String = HttpContext.Current.Server.MapPath("~") & "GEO2db\GeoLite2-Country.mmdb"
    Dim reader = New DatabaseReader(FileWithPath)
    Dim Om = reader.Omni(ip)
    Dim country As String = Om.Country.Name
    reader.Dispose()
    Return country
End Function