Split Web Page Extention using C#.Net

Split Web Page Extention using C#.Net
using System.Text.RegularExpressions;

string  splitWebPageExtension(string webPage, string extension,int idx)
        {

            Regex Splitter = new Regex(extension);
            String[] Parts = Splitter.Split(webPage);
            string st = Parts[idx];
            return st;
        }
     string webPage = "http://dotnettechrocks.blogspot.in/ ";
     string str = splitWebPageExtension(webPage, ".in", 0);
     MessageBox.Show(str);

Result :http://dotnettechrocks.blogspot