CODEWITHSUNDEEP
vb.neterror-handling
ralaba
ralaba

Reputation: 1

Adding Error Handlers In VB

  ' Button which allows the user to enter in there own password
    Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click


        Try
            If TextBox3.Text & TextBox6.Text & TextBox7.Text & TextBox8.Text > 0 And TextBox4.Text <> "" Then
                'input in these textboxes must be numerical
                ' It adds the passwords which is made by the user himself 
                ListBox1.Items.Add("Application : " & TextBox4.Text & " Password : " & TextBox3.Text & TextBox6.Text & TextBox7.Text & TextBox8.Text & " Time : " & TimeString & " Date : " & DateTime.Today)

            End If
        Catch ex As Exception
            MessageBox.Show("Please provide correct input")


        End Try

I'm currently making a password generator on visual basic , i have displayed the code in the part where the user can make there own password , however i wish to have some error handlers , currently i have got it working so a error message is displayed if non numeric information is entered into textbox3,6,7,8 . this works , however i wish to add two things 1. An error message if textboxes3,6,7,8 are empty 2. An error message if textbox4 is empty , curently nothing is printed in the listbox but no error message is displayed.

P.S A beginner to vb

Upvotes: 0

Views: 50

Answers (2)

Nkole Evans
Nkole Evans

Reputation: 359

You don't really need exception handling for validation. You can use the built in methods to do this.

For example the following checks if a texbox called ExampleTextBox has input and the input is a valid integer.

 If String.IsNullOrEmpty(ExampleTextBox.Text) Then
   'no input
 Else
   'has input, check if number
    Dim enteredNumber As Integer

    If Integer.TryParse(ExampleTextBox.Text, enteredNumber) Then
       'input is a valid integer
    Else
       'input is not a valid integer
    End If

End If

Upvotes: 3

jmcilhinney
jmcilhinney

Reputation: 54427

This doesn't make sense:

If TextBox3.Text & TextBox6.Text & TextBox7.Text & TextBox8.Text > 0 And TextBox4.Text <> "" Then

Say out loud what you want and build it up one piece at a time. You want to display a message if TextBox3 is empty:

If TextBox3.Text = String.Empty Then

You want to display a message if TextBox3 or TextBox6 is empty:

If TextBox3.Text = String.Empty OrElse TextBox6.Text = String.Empty Then

Etc, etc.

Upvotes: 1

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