private void Button1_Click(object sender, EventArgs e)
{
    int num;
    long num2;
    string s = "";
    string str3 = "";
    bool flag = true;
    if (Strings.Len(this.TextBox1.Text) == 5)
    {
        int num3 = this.TextBox1.TextLength - 1;
        for (num = 1; num <= num3; num++)
        {
            num2 = Conversions.ToLong(Conversions.ToString(num2) + Conversions.ToString(Strings.Asc(this.TextBox1.Text[num])));
        }
    }
    if (Strings.Len(num2.ToString()) >= 10)
    {
        num2 = Conversions.ToLong(Strings.Mid(Conversions.ToString(num2), 2, 8));
    }
    string str = this.wert(num2);
    int num4 = str.Length - 1;
    for (num = 0; num <= num4; num += 5)
    {
        string zahl = Strings.Mid(str, num + 1, 5);
        string str5 = Conversions.ToString(this.Quersumme(zahl));
        s = s + str5;
    }
    str3 = this.TextBox4.Text + this.TextBox5.Text + this.TextBox6.Text + this.TextBox7.Text;
    byte[] bytes = Encoding.ASCII.GetBytes(s);
    byte[] buffer = Encoding.ASCII.GetBytes(str3);
    MD5CryptoServiceProvider provider = new MD5CryptoServiceProvider();
    byte[] buffer3 = provider.ComputeHash(bytes);
    byte[] buffer4 = provider.ComputeHash(buffer);
    int num5 = buffer3.Length - 1;
    for (num = 0; num <= num5; num++)
    {
        if (buffer4[num] == buffer3[num])
        {
            flag = false;
        }
        else
        {
            flag = true;
            break;
        }
    }
    if (!flag)
    {
        this.TextBox3.Text = "PASS";
    }
    else
    {
        this.TextBox3.Text = "FAIL";
    }
}