Visual Basic 2010: Text Box Help

**JRR** · January 22, 2011, 01:46 PM

Hi,
I have recently built my own VB 2010 program from scratch, i am still learning, but in my program, when i press a button i get a error, this is because in my text box i am adding numbers then when i press the button it does a sum and pastes them into another text box, but if i add proper text in there ( which i dont want, it crashes)
So how do i stop users from entering text in a text box and enter only numbers?
Thanks for any help

**Bolkonsky** · January 22, 2011, 08:46 PM

Code:

    Private Sub TextBox1_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
        If Not Char.IsNumber(e.KeyChar) And Not Char.IsControl(e.KeyChar) Then
            e.Handled = True
            MessageBox.Show("Error!  Please Stick to Numbers")
        End If
    End Sub

That should work, though I don't know if backspace will work. I can't test it at the moment, but I think that it will. Lemme know if you have any problems with it.

EDIT:

OK, I just checked it and it works fine.

**JRR** · January 24, 2011, 09:39 AM

When i pasted it into the code view, it gave me these errors (attached screenshots)
Thanks

**Dewy** · January 25, 2011, 03:52 AM

The key press handler was never defined and the two other errors stem from that.

**JRR** · January 25, 2011, 09:56 AM

Sorry i am new at it, so how do i make it work ?

**Dewy** · January 25, 2011, 10:22 AM

You are missing this (below) in form1.designer.vb (you'll have to check your project directory to open that file) EDIT: It goes at the bottom after end sub but before end class.

Code:

Friend WithEvents TextBox1 As System.Windows.Forms.TextBox

However that leads me to believe the name of your textbox isn't textbox1, wait you'll get different errors if that was the case or would you

. If that doesn't work upload your project and I'll take a look at it. Please note though my vb.net skills aren't that good, so hopefully what I am telling you is correct

**JRR** · January 25, 2011, 11:13 AM

Thanks, ive got it working

**Bolkonsky** · January 25, 2011, 11:31 AM

Good to hear!

EDIT:

I've got a question, Dewy. I'm running Visual Basic 2010, and I tested that script, and it worked perfectly, w/o the Friend WithEvents stuff. Why would it be different from his?

**Dewy** · January 25, 2011, 02:17 PM

Originally Posted by caius_titus_ceasar

Thanks, ive got it working

Good to hear.

Originally Posted by Bolkonsky

Good to hear!

EDIT:

I've got a question, Dewy. I'm running Visual Basic 2010, and I tested that script, and it worked perfectly, w/o the Friend WithEvents stuff. Why would it be different from his?

I have no idea.