Question

I am multithreading with a threadpool and whenever i try to start the requests i get

Object reference not set to an instance of an object.

on

Application.Run(new Form1());

I don’t have the same problem without the proxies tho

This is the code that causes trouble

if (ProxyBox.Text != string.Empty)
{
     lock (locker)
     {
         Random rnd = new Random();
         int rndd = rnd.Next(0, int.Parse(ProxyNumber.Text));
         request.Proxy = new WebProxy(proxysplit[rndd].ToString());
     }
}

Basicaly i want to get a random proxy from the proxysplit array everytime

Any Ideas 😕

Answer 1

There are multiple questions you need to answer before we can help you:

1. Which line is the error occurring on?
2. Is the specified proxy initialized (i.e. not null)?
3. Furthermore, is proxysplit initialized?

Check what’s not initialized and you may also want to generate the random number between 0 and the number of elements in proxysplit:

if (ProxyBox.Text != string.Empty)
{
    lock (locker)
    {
        Random rnd = new Random();
        int rndd = rnd.Next(0, proxysplit.Length);
        request.Proxy = new WebProxy(proxysplit[rndd].ToString());
    }
}

If you use the the ProxyNumber and the resulting integer is outside the range of the proxysplit array length, then you may also get an exception while trying to access an element out of range, i.e. ArgumentOutOfRangeException.