Get the highest percentage similarity using C#

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C#

C#4.0

hye It's the first time I'm using c# so I'm not very familiar with it.I have a coding to get the percentage similarity of files. In this program, I have written all the paths of file in notepad which I will compare it with the input file. After I input file and then run, it will compare the input file with a list path of files in notepad and then it will list all the percentage similarity for all the file. I want to know, How I want to create coding to get the highest percentage similarity from the comparison of files? And then it will pop up message that will show the highest percentage from all the list of files.My notepad file name is inputlist.txt. this program have dual mode. first compare between two input file and second is compare input file with path file in notepad. this is my coding :

private void buttonbrowse1_Click(object sender, EventArgs e)
{
    if (openFileDialog1.ShowDialog() == DialogResult.OK)
        textBoxfile1.Text = openFileDialog1.FileName;
}

private void buttonbrowse2_Click(object sender, EventArgs e)
{
    if (openFileDialog2.ShowDialog() == DialogResult.OK)
        textBoxfile2.Text = openFileDialog2.FileName;
}

private void buttoncompute_Click(object sender, EventArgs e)
{
    timer1.Start();
}

private void timer1_Tick(object sender, EventArgs e)
{
    textBox3.Text = "";
    if (!checkBox1.Checked)
    {
       FileInfo f1 = new FileInfo(textBoxfile1.Text);
       FileInfo f2 = new FileInfo(textBoxfile2.Text);
       if (f2.Length < f1.Length)
       {
           string tmp = textBoxfile1.Text;
           textBoxfile1.Text = textBoxfile2.Text;
           textBoxfile2.Text = tmp;
       }
       Process p = new Process();
       p.StartInfo.FileName = "bsdiff.exe";
       p.StartInfo.Arguments = "\"" + textBoxfile1.Text + "\" \"" + textBoxfile2.Text + "\" diff.bin";



       p.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
       p.Start();
       p.WaitForExit();
       FileInfo fi = new FileInfo("diff.bin");


       long lenf3 = f1.Length > f2.Length ? f1.Length : f2.Length;
       long filen = (fi.Length - 140) > 0 ? (fi.Length - 140) : 0;
       float diff = (lenf3 - (filen));

       textBox3.Text = "\r\nDifference of two files:" + (filen) + " bytes ";
       float similar = (diff / lenf3) * 100;
       textBox3.Text += "\r\nPercentage of similarity : " + similar + "%";
       timer1.Stop();
     }
     else
     {
        var lines = File.ReadAllLines("inputlist.txt");
        textBox3.Text += "\r\n\r\nComparing\r\nFile1:" + textBoxfile1.Text+"\r\n----------------------------------\r\n";
        foreach (var line in lines)
        {
           textBoxfile2.Text = line;
           FileInfo f1 = new FileInfo(textBoxfile1.Text);
           FileInfo f2 = new FileInfo(textBoxfile2.Text);
           string file1 = textBoxfile1.Text;
           string file2 = textBoxfile2.Text;
           if (f2.Length < f1.Length)
           {
              string tmp = file1;
              file1 = file2;
              file2 = tmp;
           }
           f1 = new FileInfo(file1);
           f2 = new FileInfo(file2);
           Process p = new Process();
           p.StartInfo.FileName = "bsdiff.exe";
           p.StartInfo.Arguments = "\"" + file1 + "\" \"" + file2 + "\" diff.bin";



           p.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
           p.Start();
           p.WaitForExit();
           FileInfo fi = new FileInfo("diff.bin");


           long lenf3 = f1.Length > f2.Length ? f1.Length : f2.Length;
           long filen = (fi.Length - 140)>0?(fi.Length - 140):0;
           float diff = (lenf3 - (filen));


           textBox3.Text += "\r\n\r\n" + file1+","+file2;
           textBox3.Text += "\r\nDifference of two files:" + (filen) + " bytes ";
           float similar = (diff / lenf3) * 100;
           textBox3.Text += "\r\nPercentage of similarity : " + similar + "%";

         }
         timer1.Stop();
     }
  }

private void MainForm_Load(object sender, EventArgs e)
{

}

private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
   groupBox1.Visible = !checkBox1.Checked;
}

private void textBox3_TextChanged(object sender, EventArgs e)
{

}