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Posted on 2012-03-11
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Last Modified: 2012-06-27
The attached code shows a simple form with one text box and one button to enter a name and to show a welcome message when the button is clicked.

It works okay but sometimes errors at the End command at line marked by '*********

The code was created using vs2008 and I am running it in vs2010.

Question1: Is this command (End)no longer valid in vs2010?

Error:  Win32Exception was unhandled;  Error creating window handle

Thank you.

code:
Public Class frmWelcomeStudent

    Private Sub cmdWelcome_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdWelcome.Click

        Dim intResponse As Integer
        Dim strMsg As String
        Dim strTitle As String
        Dim strName As String

        'store student name after triming the blank spaces either side
        strName = Trim(txtUserName.Text)

        'check to see if user name is left blank
        If Len(strName) = 0 Then

            MessageBox.Show("Please enter a name.", "User Name Is Blank...")
            txtUserName.Focus()
            txtUserName.SelectAll()

        Else

            'check to see at least the first char is "A" thru "z"
            If strName.Substring(0, 1) >= "A" And strName.Substring(0, 1) <= "z" Then

                strMsg = "Welcome to CS 19 '" & strName & "'." & vbNewLine & vbNewLine & _
                         "Do you want to exit?"

                strTitle = "Message To Student..."

                intResponse = MessageBox.Show(strMsg, strTitle, MessageBoxButtons.YesNo, _
                              MessageBoxIcon.Question)

                If intResponse = vbYes Then
                    End  '***************************
                Else

                    txtUserName.Clear()
                    txtUserName.Focus()

                End If
            Else

                MessageBox.Show("Please enter a name starting with a letter.", "User Name '" & _
                                 strName & "' Not Valid...")
                txtUserName.Focus()
                txtUserName.SelectAll()

            End If

        End If

    End Sub

End Class
0
Comment
Question by:Mike Eghtebas
2 Comments
 
LVL 86

Accepted Solution

by:
Mike Tomlinson earned 2000 total points
ID: 37708372
Instead of "End", you could use "Application.Exit".  A less harsh option would be to close the main form with Close() so that the application exits normally.
0
 
LVL 34

Author Comment

by:Mike Eghtebas
ID: 37708484
Hi Idle_Mind,

You probably recall while back I was looking to simulate a fuel gauge:

For example:
Drive 60 miles
Gas use 30 miles/gal
Fuel gauge shows 15 Gal.
Upon a click on "Drive" button, the indicator arm swings from 15 down to 13 gal.

Later on, to make it more complex, one can add velocity parameter for the fuel gauge operate like an analog instrument. But that is for much later.

Recently I took some Java course and did a similar animation (simulation). But with this fuel gauge I will need you help. I also am about to start a database development job so I will be able to visit your profile often.

Regards,

Mike
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