Asp.net 对象引用未设置为对象的实例

在asp.net web服务应用程序中将某些项插入数据库时，我遇到了一个问题

这是我的密码

 public void DoRequestLog(HttpRequest request)
        {
            string UserAgent = request.Headers["User-Agent"];
            string Date = "4/14/2011";//request.Headers["Date"];
            string HostIP = request.Headers["Host"];
            string URL = request.Headers["Referer"];
            string MethodName = request.HttpMethod;
            string VersionNo = "";
            string IMEINo = "";

        string dbString = Configuration.GetDBConnectionString();

        SqlConnection DardSqlConnection = new SqlConnection(dbString);

        DardSqlConnection.Open();

        SqlCommand log = DardSqlConnection.CreateCommand();

        log.CommandText = "insert into ConnectionLog values('"+UserAgent+"','"+Date+"','"+HostIP+"','"+URL+"','"+MethodName+"','"+VersionNo+"','"+IMEINo+"');";

        log.ExecuteNonQuery();

    }

请帮忙 因为我不熟悉.net环境。

请尝试以下方法：

public void DoRequestLog(HttpRequest request)
 {
     // We don’t need to log anything if there is no HTTP request.
     if (request == null)
         return;

     string UserAgent = request.Headers["User-Agent"];
     string Date = "4/14/2011";//request.Headers["Date"]; 
     ...

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您在哪一行得到错误？这是DotNetNuke应用程序吗？在这里，我得到一个错误日志