namespace _8ChuXu
{
    class Program
    {
        static void Main()
        {
            int p = 5;
            int q = 4;
            Program pro = new Program();
            pro.select(p, q);
            Console.WriteLine(p );
            Console.ReadLine();
        }
        public void select(int a, int b)
        {

            a += b;
        }
        
    }
}
就是最后结果运行不对，请求帮忙解决

select()方法改为

public void select(ref int a,int b)

{
    a+=b;
}

我附带个有的难度的问题
class config()
{        
public Socket ClientSocket;
        private void button1_Click_1(object sender, EventArgs e)
        {                                
            IPEndPoint ServerInfo = new IPEndPoint(IPAddress.Parse("127.0.0.1"), Convert.ToInt32(6000));
            Socket ClientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            ClientSocket.Connect(ServerInfo);
            MessageBox.Show("连接成功！", "提示");           
        }
}
class program()
{   
        fmConfig pfmConfig = new fmConfig();
        public bool SendToClient(string data)
        {
            try
            {
                byte[] sendBuffer = new byte[10240];
                int dataLen = System.Text.Encoding.UTF8.GetBytes(data, 0, data.Length, sendBuffer, 4); //utf8编码
                sendBuffer[0] = 0x1F;
                sendBuffer[1] = 0xF1;
                CopyByte(sendBuffer, 2, dataLen, 2);
                dataLen += 4;
                pfmConfig.ClientSocket.BeginSend(sendBuffer, 0, dataLen, 0, new AsyncCallback(SendCallBack), pfmConfig.ClientSocket);//这条语句
                return true;
            }
            catch (Exception e)
            {
                return false;
            }
        }
}
上面的那条语句想调用config类中的ClientSocket，可以吗，有什么问题？

类名都不匹配呀

哪些类名不匹配，可以具体指出来，我一一解决

fmConfig pfmConfig = new fmConfig();
与类Config

class fmconfig()
{        
public Socket ClientSocket;
        private void button1_Click_1(object sender, EventArgs e)
        {                                
            IPEndPoint ServerInfo = new IPEndPoint(IPAddress.Parse("127.0.0.1"), Convert.ToInt32(6000));
            Socket ClientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            ClientSocket.Connect(ServerInfo);
            MessageBox.Show("连接成功！", "提示");           
        }
}
class program()
{   
        fmConfig pfmConfig = new fmConfig();
        public bool SendToClient(string data)
        {
            try
            {
                byte[] sendBuffer = new byte[10240];
                int dataLen = System.Text.Encoding.UTF8.GetBytes(data, 0, data.Length, sendBuffer, 4); //utf8编码
                sendBuffer[0] = 0x1F;
                sendBuffer[1] = 0xF1;
                CopyByte(sendBuffer, 2, dataLen, 2);
                dataLen += 4;
                pfmConfig.ClientSocket.BeginSend(sendBuffer, 0, dataLen, 0, new AsyncCallback(SendCallBack), pfmConfig.ClientSocket);//这条语句
                return true;
            }
            catch (Exception e)
            {
                return false;
            }
        }
}
上面的那条语句想调用config类中的ClientSocket，可以吗，有什么问题？
抱歉，是我在论坛上写错了，现在改正确了。
可是怎么样才能正确调用，我调用的对吗

1.fmconfig()类没有修饰符，默认是私有的，不能再其他类中调用
2. private void button1_Click_1(object sender, EventArgs e)是触发的事件，没有触发Socket对象就没有实例化

1、fmconfig类是公有的，可以在其他类中调用
2、button1_Click_1()是触发事件，触发完才调用ClientSocket的
那怎么样才能调用呢