Question

I’m trying to Create a login form, and registration form.
My registration form is complete,
by registrating an XML file is created with this code,

    private void newregisterBtn_Click(object sender, EventArgs e)
    {
        if (usernameTxb.Text == null && nameTxb.Text == null && ageTxb.Text == null && countryTxb.Text == null && passwordTxb.Text == null)
       {
            usernLbl.ForeColor = Color.Red;
            nameLbl.ForeColor = Color.Red;
            ageLbl.ForeColor = Color.Red;
            countryLbl.ForeColor = Color.Red;
            passwordLbl.ForeColor = Color.Red;
 // this doesn't work

        }
        else
        {
            string filename = @"C:\\testxml\\" + usernameTxb.Text + ".xml";

            XmlDocument doc = new XmlDocument();
            XmlElement root = doc.CreateElement("Login");
            XmlElement id = doc.CreateElement("id");
            id.SetAttribute("userName", usernameTxb.Text);
            id.SetAttribute("passWord", passwordTxb.Text);
            XmlElement name = doc.CreateElement("Name");
            name.InnerText = nameTxb.Text; 
            XmlElement age = doc.CreateElement("Age");
            age.InnerText = ageTxb.Text;
            XmlElement Country = doc.CreateElement("Country");
            Country.InnerText = countryTxb.Text;
            id.AppendChild(name);
            id.AppendChild(age);
            id.AppendChild(Country);
            root.AppendChild(id);
            doc.AppendChild(root); 
            doc.Save(filename);
            MessageBox.Show("Created SuccesFully!");
            this.Close();

        }
    }

Now that’s not to important, on my second form (login form), i just got an ‘usernameTxb’ a ‘passwordTxb’ a ‘loginBtn’ and a ‘registerBtn’.

Now i want a piece of code that finds and see if the usernameTxb and passwordTxb are equal to the info writen into the xml file.
here is some xml code.

<Login>
  <id userName="Username" passWord="password">
    <Name>Joshua Maerten</Name> 
    <Age>21</Age> 
    <Country>Belgium</Country> 
  </id>
</Login>

Answer 1

If you can use LINQ for XML parsing this should conceptually work based on your XML:

public static bool IsValidLogin(string user, string password)
{
    XDocument doc = XDocument.Load("Login.xml");

    return doc.Descendants("id")
              .Where(id => id.Attribute("userName").Value == user 
                     && id.Attribute("passWord").Value == password)
              .Any();
}