Generating random strings

I am generating 12 random strings and my code works fine when I step
through, but when I then let it run without stepping through and
populate a listbox with the array I am building, I get the same value
repeated 12 times. Here is my code :

protected void btnGenerate_Click(object sender, EventArgs e)
{
string strDomainName = txtDomainName.Text.ToString();
string strEmailAddress = "";
string strEmailAddressComplete = "";

ArrayList arrEmailAddresses = new ArrayList();

for (int i = 0; i <= 12; i++)
{
//create 12 random email addresses for domain
EmailAddressGenerator emg = new EmailAddressGenerator();
strEmailAddress = emg.GenerateEmailAddress();
strEmailAddressComplete = strEmailAddress + "@" +
strDomainName;

//add email addresses to array
arrEmailAddresses.Add(strEmailAddressComplete);
}

foreach (string address in arrEmailAddresses)
{
lstEmailAddresses.Items.Add(address);
}
}





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