Ggtcf

This code is supposed to parse an email into the username and domain name. If I type in apa@gmail.com, a message box displays and says "Username: apa Domain Name: gmail.com".
I adapted the code from my textbook and keep getting the above error message at email = Email.Remove(0, 1); and domainName = Email.Remove(Email.Length -1, 1). Any suggestions?

public partial class StringHandling : Form
{
 string email = "";
 string state = "";
 string city = "";
 int zipCode = 0;

 public StringHandling()
 
 InitializeComponent();
 

 private void btnParse_Click(object sender, EventArgs e)
 {
 string Email = "";
 string domainName = "";
 email = txtEmail.Text;
 email = Email.Trim();
 if (email.StartsWith(""))
 email = Email.Remove(0, 1);
 if (email.EndsWith("@"))
 domainName = Email.Remove(Email.Length - 1, 1);

 MessageBox.Show("Username: " + email + "n" + "Domain Name: " + domainName);

email.StartsWith("") will always be true (You've haven't actually specified anything that email should start with). Since it will always start with an empty string, when you attempt to call email = Email.Remove(0, 1);. You're attempting to remove the first character, and because the string is empty, there is no first character (The total string length is 0), so you get that exception.

My suggestion: Avoid multiple variables with different capitalization (ie. email and Email). This is leading to some confusion. These are 2 separate variables, and at no point have you assigned anything to Email (Capitol E), so in the case of email = Email.Remove(0, 1);, Email will always be an empty string and throw this error.