How to check the inserted test in a text box is number?

Question

How to check the inserted test in a textbox is number?

In vb windows phone application.

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Answer 1

Hello vensilver,

How to check the inserted test in a textbox is number?

In vb windows phone application.

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MS-MSP vensilver is out here to solve biggest problems .Blogger at http://www.techon.yolasite.com/

Welcome on the msdn forum for questions about WindowsPhone leave you the link of the forum dedicated.

http://forums.create.msdn.com/forums/

 

Best Regards.

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Carmelo La Monica

Blog http://community.visual-basic.it/carmelolamonica/

WordPress http://carmelolamonica.wordpress.com/

Twitter  http://twitter.com/carmelolamonica

Answer 2

ok ,I will put it this way how to check where entered text in textbox is number?

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Blogger at http://www.livetut.com/

Answer 3

YOu can do this:

Dim i As Integer = 0

Integer.TryParse(textBox1.Text, i)

If i = 0 Then
	MessageBox.Show("textBox1 contained non-numeric text")
Else
	MessageBox.Show("textBox1 contained a number")
End If

 or

If Not (IsNumeric(textBox1.Text))

 Then

 MessageBox.Show("textBox1 contained non-numeric text")

 Else

 MessageBox.Show("textBox1 contained a number")

 End If

 

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Tom Overton

Answer 4

YOu can do this:

Dim i As Integer = 0

Integer.TryParse(textBox1.Text, i)

If i = 0 Then
	MessageBox.Show("textBox1 contained non-numeric text")
Else
	MessageBox.Show("textBox1 contained a number")
End If

 or

If Not IsNumeric(textBox1.Text) 

 Then

 MessageBox.Show("textBox1 contained non-numeric text")

 Else

 MessageBox.Show("textBox1 contained a number")

 End If

 

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Tom Overton

integer shows error

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Blogger at http://www.livetut.com/

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Blogger at http://www.livetut.com/

Answer 5

Hello vensilver,

ok ,I will put it this way how to check where entered text in textbox is number?

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Blogger at http://www.livetut.com/

try this example whit if Condition

 

  Private Sub Button3_Click(sender As System.Object, e As System.EventArgs) Handles Button3.Click
        Dim myNumber As Integer

        If Integer.TryParse(Me.TextBox1.Text, myNumber) Then
            MessageBox.Show(myNumber & "is number")
        Else
            MessageBox.Show(myNumber & "is not number")
        End If
    End Sub

Regards.

 

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Carmelo La Monica

Blog http://community.visual-basic.it/carmelolamonica/

WordPress http://carmelolamonica.wordpress.com/

Twitter  http://twitter.com/carmelolamonica

Answer 6

Make sure you're doing this within a method.

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Tom Overton

Answer 7

Hello vensilver,

ok ,I will put it this way how to check where entered text in textbox is number?

---

Blogger at http://www.livetut.com/

try this example whit if Condition

 

  Private Sub Button3_Click(sender As System.Object, e As System.EventArgs) Handles Button3.Click
        Dim myNumber As Integer

        If Integer.TryParse(Me.TextBox1.Text, myNumber) Then
            MessageBox.Show(myNumber & "is number")
        Else
            MessageBox.Show(myNumber & "is not number")
        End If
    End Sub

Regards.

 

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Carmelo La Monica Blog http://community.visual-basic.it/carmelolamonica/ WordPress http://carmelolamonica.wordpress.com/ Twitter http://twitter.com/carmelolamonica

thanks :)

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Blogger at http://www.livetut.com/

Answer 8

Hello vensilver,

thanks :)

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You're Welcome.

Please note that this example is only 32bit integers, but if you believe you should use another type of data, double, decimal, you have to Sequencing and methods Double.TryParse Decimal.TryParse.
Moreover, the property also has double isNAN a method that checks if the value that law and a number or not.

 

edit:I noticed the image that you entered the code suggested by Tom in an event or method, if placed in one of these works fine.

Regards.

---

Carmelo La Monica

Blog http://community.visual-basic.it/carmelolamonica/

WordPress http://carmelolamonica.wordpress.com/

Twitter  http://twitter.com/carmelolamonica

Answer 9

If I may correct this, because entering "0" shouldn't show an error. :-)

      Dim i As Integer = 0

      If Integer.TryParse(textBox1.Text, i) Then
         MessageBox.Show("textBox1 contained a number")
      Else
         MessageBox.Show("textBox1 contained non-numeric text")
      End If

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Armin

Answer 10

Hy Armin ,

If I may correct this, because entering "0" shouldn't show an error. :-)

 

      Dim i As Integer = 0

      If Integer.TryParse(textBox1.Text, i) Then
         MessageBox.Show("textBox1 contained a number")
      Else
         MessageBox.Show("textBox1 contained non-numeric text")
      End If

 

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Armin

what kind of error mean? :)

 

Bye

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Carmelo La Monica

Blog http://community.visual-basic.it/carmelolamonica/

WordPress http://carmelolamonica.wordpress.com/

Twitter  http://twitter.com/carmelolamonica

Answer 11

Sorry, I meant in the sense of "success" vs. "error". The first messagebox is succes, the other is error.

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Armin

Answer 12

Hy Armin,

Sorry, I meant in the sense of "success" vs. "error". The first messagebox is succes, the other is error.

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Armin

do not worry, do not apologize for anything, and is correct as you said, the first messagebox and means that all right, while the second and the error. Then and only an example and can be greatly improved.
Anyway I apologize to you, but unfortunately the communication for me and a big problem :)

Bye

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Carmelo La Monica

Blog http://community.visual-basic.it/carmelolamonica/

WordPress http://carmelolamonica.wordpress.com/

Twitter  http://twitter.com/carmelolamonica

Answer 13

No need to apologize, too! :)  lol

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Armin