请问一个类型转化的有关问题

请教一个类型转化的问题
基于OMRON Fins通信的实验,找了好几种方法，结果都遇到了vbstring在C#中类型不匹配的问题。
本人玩C#纯属业余爱好，想请大师们指点迷经。

C# code

//================================================================================================================        //VB6.0事件处理 OnReceive()如下,收发数据正常。        //Private Sub Command1_Click()        //FinsMsg1.sendFinsCommand 0, 1, 0, "0101820064000002"        //End Sub        //Private Sub FinsMsg1_OnReceive()        //Dim net As Integer, node As Integer, unit As Integer        //Text1.Text = FinsMsg1.receiveMessage(net, node, unit, vbString)        //End Sub        //================================================================================================================        private void button1_Click(object sender, EventArgs e)        {            axFinsMsg1.sendFinsCommand(0, 1, 0, "0101820064000002");        }                private void axFinsMsg1_OnReceive(object sender, EventArgs e)        {            //public virtual object receiveMessage(ref short netID, ref short nodeID, ref short unitID, object messageType)            //AxFINSMSGCTLLib.AxFinsMsg 的成员            short a=0,b=0,c=0;            object temp=new object();            textBox1.Text = axFinsMsg1.receiveMessage(ref a,ref  b,ref c,temp);            //错误    1    无法将类型“object”隐式转换为“string”。存在一个显式转换(是否缺少强制转换?)                     }

C# code

textBox1.Text = axFinsMsg1.receiveMessage(ref a,ref  b,ref c,temp.toString());
[解决办法]
receiveMessage是返回什么类型，如果是object，你需要 ToString(),才能赋值给Text