Question

Possible Duplicate:
compare two ip with C#

How to compare two IP? By compare I mean to tell whether IP1 is greater that IP2. Is that possible? As I see, IPAddress does not have that functionality.

Answer 1

EDIT (This might work for all condition which is specified in comments )

string ip1= "1.2.3.4";
string ip2 ="5.6.7.8";

string[] ip1S = ip1.Split(new char[] {'.'});
string[] ip2S = ip2.Split(new char[] {'.'});

for(int i=0;i<4;i++)
{
  if(Convert.ToInt32(ip1S[i]) > Convert.ToInt32(ip2S[i]))
  {
    Console.WriteLine("ip1 is higher");
    break;
  }
  else if(Convert.ToInt32(ip2S[i]) > Convert.ToInt32(ip1S[i])) 
   {
    Console.WriteLine("ip2 is higher");
    break;
  }  
}

---

Old

you can do string comapre like this

string ip1= "1.2.3.4";
string ip2 ="5.6.7.8";

string ip1R = ip1.Replace(".","");
string ip2R = ip2.Replace(".","");


Console.WriteLine(String.Compare(ip1R ,ip2R ));

output

A negative integer    str1 is less than str2.
0                     str1 equals str2.
A positive integer    This instance is greater than value.
-or-
1

For more change string compare on MSDN : http://msdn.microsoft.com/en-us/library/fbh501kz(v=vs.80).aspx