how to convert string to System.Net.IPAddress

Question

how can i convert string to System.Net,IPAddress in C#/.net 3.5

i tried this but i got this error "Cannot convert type 'string' to 'System.Net.IPAddress'"

 public void Form1_Load(object sender, EventArgs e)
    {
        IPHostEntry host;
        string localIP = "?";
        host = Dns.GetHostEntry(Dns.GetHostName());
        foreach (IPAddress ip in File.ReadAllLines("proxy.txt"))
        {
            if (ip.AddressFamily.ToString() == "InterNetwork")
            {
                localIP = ip.ToString();
                textBox1.Text = ip.ToString();
            }
        }

   }

Answer 1

Use the static IPAddress.Parse method to parse a string into an IPAddress:

foreach (var ipLine in File.ReadAllLines("proxy.txt"))
{
    var ip = IPAddress.Parse(ipLine);
    if (ip.AddressFamily.ToString() == "InterNetwork")
    {
        localIP = ip.ToString();
        textBox1.Text = ip.ToString();
    }
}

If the lines in the file are not always valid IP addresses, you may want to consider using TryParse to avoid any exceptions being thrown.

Answer 2

The IPAddress.Parse method accepts a string.

foreach (string line in File.ReadAllLines("proxy.txt"))
{
    IPAddress ip = IPAddress.Parse(line);
    // ...
}