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private bool keyNotExists()
{
    string str;
    Download.download("keysCM.keyx", @"C:\Temp\Crack_Mail");
    StreamReader reader = new StreamReader(@"C:\Temp\Crack_Mail\keysCM.keyx");
    while ((str = reader.ReadLine()) != null)
    {
        if (str.Equals(this.textBox1.Text.Trim() + " " + this.textBox2.Text.Trim() + " " + this.textBox3.Text.Trim() + " " + this.textBox4.Text.Trim() + " " + this.textBox5.Text.Trim()))
        {
            PMessage.showError("Der eingegebene Key wird bereits verwendet", "Error");
            reader.Close();
            return false;
        }
    }
    reader.Close();
    File.Delete(@"C:\Temp\Crack_Mail\keysCM.keyx");
    return true;
}

private bool checkKey()
{
    string text = this.textBox1.Text.Trim();
    int num = 0;
    int num2 = 0;
    if (text.Length == 8)
    {
        int num3;
        for (num3 = 0; num3 < text.Length; num3++)
        {
            num += text[num3];
        }
        if (this.checkNum(this.textBox2.Text.Trim()))
        {
            if (num != Convert.ToInt32(this.textBox2.Text.Trim()))
            {
                return false;
            }
            text = this.textBox3.Text;
            if (text.Length != 8)
            {
                return false;
            }
            for (num3 = 0; num3 < text.Length; num3++)
            {
                num2 += text[num3];
            }
            if (!this.checkNum(this.textBox4.Text.Trim()))
            {
                return false;
            }
            if (num2 != Convert.ToInt32(this.textBox4.Text.Trim()))
            {
                return false;
            }
            if ((num + num2) == Convert.ToInt32(this.textBox5.Text.Trim()))
            {
                this.progressBar1.Value = 0x21;
                PMessage.showMessage("Das Format des Keys ist korrekt", "Key OK");
                if (this.keyNotExists())
                {
                    this.label4.Text = "\x00dcberpr\x00fcfe Produkt-Key";
                    this.progressBar1.Value = 0x4b;
                    this.gen();
                    return true;
                }
                return false;
            }
            this.clear();
        }
        return false;
    }
    return false;
}