Post: Quick question..
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12-18-2013, 12:50 AM
#1
TorqueLewith
Banned
I'm making a program that needs the user to log on their email with their email and password, but throws an error if there's something wrong with their log-on details.
I used a try function, and catch ex as exception I just need to know what to put after when, I tried using it without when, but it won't throw an error.
Code:
Try
Dim pceout As New SmtpClient
pceout.Credentials = New Net.NetworkCredential(Email.Text, Password.Text)
pceout.Port = Port.Text
If ComboBox1.Text = "Gmail" Then
pceout.Host = "smtp.gmail.com"
ElseIf ComboBox1.Text = "Yahoo" Then
pceout.Host = "smtp.mail.yahoo.com"
ElseIf ComboBox1.Text = "Hotmail" Then
pceout.Host = "smtp.live.com"
ElseIf ComboBox1.Text = "AOL" Then
pceout.Host = "smtp.aol.com"
End If
Button3.Enabled = True
Catch ex As Exception
MsgBox("Error")
Button3.Enabled = False
End Try
12-18-2013, 06:41 AM
#3
TorqueLewith
Banned
12-24-2013, 02:35 AM
#4
Oneup
Guest
If you are trying to use a try catch you need to understand what happens where.
In the catch block is where you will get your error message.You can either have it print out what you want it to say or you can have it throw the actually exception
So something like:
In the catch block is where you will get your error message.You can either have it print out what you want it to say or you can have it throw the actually exception
So something like:
Try
Catch ex as exception
Messagebox.show(ex.tostring)
End Try
12-24-2013, 02:38 AM
#5
TorqueLewith
Banned
12-24-2013, 02:43 AM
#6
Oneup
Guest
Originally posted by TorqueLewith
I dont get it.. When I do that, it only throws the error whenever the textbox is empty. It doesn't throw an error if the email or password is wrong..
Well its going to trip on the first thing that will cause the program to crash. Since you are trying to establish a connection first with
pceout.Credentials = New Net.NetworkCredential(Email.Text, Password.Text)
it's going to fail and drop to the catch since the textboxes are empty
12-24-2013, 02:45 AM
#7
TorqueLewith
Banned
Originally posted by 1UP
Well its going to trip on the first thing that will cause the program to crash. Since you are trying to establish a connection first with
pceout.Credentials = New Net.NetworkCredential(Email.Text, Password.Text)
it's going to fail and drop to the catch since the textboxes are empty
pceout.Credentials = New Net.NetworkCredential(Email.Text, Password.Text)
it's going to fail and drop to the catch since the textboxes are empty
Oh, okay.. So would I put the catch block at the top before dimming the credential, then another one after..?
12-24-2013, 02:59 AM
#9
TorqueLewith
Banned
12-24-2013, 03:09 AM
#10
Oneup
Guest
Originally posted by TorqueLewith
What would I put after an if, if i wanted to check their network credentials to make sure their email or password is right?
Well this is how I would do it
Dim ErrorMessage as string = ""
'Check that textboxes aren't empty
If txtEmail.text = "" Then ErrorMessage ="Please enter an Email Address!" & Environment.newline
If txtPassword.text = "" Then ErrorMessage ="Please enter a password!" & Environment.newline
If ErrorMessage ="" then
Try
Catch
End Try
Else
Messagebox.show(ErrorMessage)
End If
You could do something like this
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