if..else statement not working in foreach loop - asp.net

Question

Else statement not working properly in foreach loop? Here's my code. If something's wrong with my code explanations would be nice.
protected void getdata_Click(object sender, EventArgs e)
{
using (var db2 = new cftzClassDataContext())
{
var username = (from p in db2.cftzAccounts
where p.username.Equals(getdata2.Text)
select p);
foreach (var p in username)
{
if (getdata2.Text == p.username)
{
displayMSG.Text = "Is this correct ";
displayData.Text = p.username;
displayQuestionMark.Text = "?";
}
else
{
displayMSG.Text = "No User Found.";
}
}
}
}

Answer 1

The if statement is entirely redundant, as you have already filtered your list to only include accounts where the username equals getData2.Text. Therefore, your if test will always evaluate to true.
You can rewrite it as this, with the same effect
using (var db2 = new cftzClassDataContext())
{
var username = (from p in db2.cftzAccounts.Take(100)
where p.username.Equals(getdata2.Text)
select p);
foreach (var p in username)
{
displayMSG.Text = "Is this correct ";
displayData.Text = p.username;
displayQuestionMark.Text = "?";
}
}
However, as Hans points out, your loop is unnecessary as well, as all the usernames will be the same. Your code could be as simple as:
using (var db2 = new cftzClassDataContext())
{
var user = db2.cftzAccounts.
FirstOrDefault(account => account.username.Equals(getdata2.Text));
if (user != null)
{
displayMSG.Text = "Is this correct ";
displayData.Text = user.username;
displayQuestionMark.Text = "?";
}
else
{
displayMSG.Text = "No User Found.";
}
}

Answer 2

not sure what you try to achieve, but it looks like you are try to find if user is in database and if so, configure displayMSG object.
cant you do something like
var user=db2.Single(u=> u.username==getdata2.Text);
if no user is found, Singe will throw an exception. If you dont wont that, you can use SingleOrDefault() method
protected void getdata_Click(object sender, EventArgs e)
{
using (var db2 = new cftzClassDataContext())
{
try
{
var user=db2.Single(u=> u.username==getdata2.Text);
displayMSG.Text = "Is this correct ";
displayData.Text = user.username;
displayQuestionMark.Text = "?";
}
catch
{
displayMSG.Text = "No User Found.";
}
}
}