WHMCS license add-on with C#

[zahlio]

So I'm developing software in c#, and I use WHMCS as my license provider. So is there anyway of making c# check if the license is valid?

 

I have made a form with a text box (where users will input there license key from WHMCS), and I now need it to check if it is valid.

 

If it is, the program will give a msg.box and if it is not valid, it will give another msg.box

 

Can someone help?

 

This is currently the code I have:

 

public bool TryCn(string KeyNr, string KeyActive)

{

// check sql data base

MySqlConnection con = new MySqlConnection("server=localhost;user=username;password=password;database=keys;");

MySqlCommand cmd = new MySqlCommand("SELECT * FROM user_keys WHERE user_key = '" + KeyNr + "' AND user_active ='" + KeyActive + "';");

cmd.Connection = con;

 

con.Open();

 

MySqlDataReader reader = cmd.ExecuteReader();

if (reader.Read() != false)

{

 

if (reader.IsDBNull(0) == true)

{

cmd.Connection.Close();

reader.Dispose();

cmd.Dispose();

return false;

 

}

else

{

cmd.Connection.Close();

reader.Dispose();

cmd.Dispose();

return true;

 

}

}

else

{

return false;

}

 

}

 

private void login_Click(object sender, EventArgs e)

{

if (TryCn(KeyBox.Text, ActiveBox.Text) == true)

{

VersionCheck form_launch = new VersionCheck();

form_launch.ShowDialog();

this.Close();

}

else

{

string KeyNr = KeyBox.Text;

string KeyActive = ActiveBox.Text;

MessageBox.Show("Your key (" + KeyNr + ") was invalid or not active. \nPlease check if it is the correct key or you need to buy another month.", "WarZ Hack - Login Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

}

}

 

private void AboutLink_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)

{

AboutForm form_about = new AboutForm();

form_about.ShowDialog();

}

 

private void LoginForm_Load(object sender, EventArgs e)

{

 

}

 

private void KeyBox_TextChanged(object sender, EventArgs e)

{

 

}

 

}

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You can use socket and combined with WHMCS API