Changing Textbox.text within a method; For loop not looping due to Return

Question

Below is a button, when pressed it calls a function that pings a bunch of IP addresses. If the IP address returns a response, it adds the IP address to the output_networkSearch.Text.

private void button_networkSearch_Click(object sender, RoutedEventArgs e)
    {
        output_networkSearch.Text = networkSearch(Convert.ToInt32(input_searchLimit.Text)); 

    }

Below isn't the whole method, just the part that I can't get to work. The for loop starts at whatever the last digit on the users default gateway IP address is, and stops at whatever limit they have inputed (1 - 255).

// i is equal to the last digit in the default gateway IP, if it was 192.168.0.1 then i = 1.

for (int i = Convert.ToInt32(splitGatewayIP[3]); i <= searchLimit; i = i + 1)
                    {
                        // If the method receieves a ping reply...
                        if (PingHostSweep(gatewayIPRebuild + i))
                        {
                            // Returns 192.168.0. + i + ACTIVE
                            string response = gatewayIPRebuild + i + " ACTIVE";

                            return response;
                        }
                        else
                        {
                            string response = gatewayIPRebuild + i + " CLOSED";

                            return response;

                        }
                    }

This worked on a console application but for a WPF application it seems to run through the loop once and stop due to the return statement.

My idea to work around this would be to remove the Return Response statements and try and access the TextBox (output_networkSearch) directly.

So I would do something like:

for (int i = Convert.ToInt32(splitGatewayIP[3]); i <= searchLimit; i = i + 1)
                    {
                        // If the method receieves a ping reply...
                        if (PingHostSweep(gatewayIPRebuild + i))
                        {
                            // Returns 192.168.0. + i + ACTIVE
                            string response = gatewayIPRebuild + i + " ACTIVE";

                            output_networkSearch.Text = reponse;
                        }
                        else
                        {
                            string response = gatewayIPRebuild + i + " CLOSED";

                           output_networkSearch.Text = reponse;

                        }
                    }

HOWEVER, I can't access the textbox within the method for some reason. I've only just started learning C# so I'm not entirely familiar with how it works.

Here's an image of a partially working concept. As you can see the limit is set at 10, so it should ping IP address 1 through 10 and give an ACTIVE or CLOSED response. This did work in my console application version.

WPF version

Console version

Answer 1

This might do the trick for you

List<string> responses = new List<string>();
string response;
for (int i = Convert.ToInt32(splitGatewayIP[3]); i <= searchLimit; i = i + 1)
{
    if (PingHostSweep(gatewayIPRebuild + i))
    {
        response = gatewayIPRebuild + i + " ACTIVE";
    }
    else
    {
        response = gatewayIPRebuild + i + " CLOSED";
    }
    responses.Add(response)
}

Now after the loop the list which is responses would have the list of all the IPs which are active and closed. Like the way you do had in the console Application.