Hai
I have a text box in which when a key is pressed, i have to check if it is a number or not. The idea i had was to check with ASCII codes for numbers. if anyone Could provide a solution for thsi problem it would be great of them.
Ash

ashok

Is this a windows or web app?

VB.NET

Private Sub TextBox1_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress

        If e.KeyChar >= Chr(48) And e.KeyChar <= Chr(57) Then
            MsgBox(e.KeyChar.ToString)
        End If

End Sub

It is a Web Application and the code

  If e.KeyChar >= Chr(48) And e.KeyChar <= Chr(57) Then
            MsgBox(e.KeyChar.ToString)
        End If
isnt working
 do i have to import any name spaces
Thanks and regards
ashok

ashok

You need to use javascript for this. Are you just trying to validate that the user only enters a numeric value? If so, use the compare validator.

Hi...

The previous code was for WindowsApplication

This one is for Web Application

Anyway, let us assume that u are taking input in a textbox in a web app. First set AutoPostBack to True

Then wirte the following code in the event OnTextChanged

Protected Sub TextBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
        Dim str As String
        str = TextBox1.Text
        If Not IsNumeric(str) Then
            Response.Write("Enter a Number !!! ")
            TextBox1.Focus()
        End If
End Sub

On Losing focus OR On submitting, it will check it a number is entered. Or alternately as Benson suggested, use a CompareValidator
Regards

Hi,
Shyam Bharath

Thanks for the code. This code is getting executed only if an event occurs on the page. This is not happening on keypress. Is thare any way to handle on key press.Thanks for the reply. It would be great to read again from you.
Ashok

ashok

I am sorry...There is unfortunately no event handler either in .net 1.x or in .net 2.x for that

This might be because ecmascript does not support keypress in standard HTML textboxes. We may have to wait for some future version of ecmascript to support that.

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Is there a similar funtion in C#.net i.e., like IsNumeric or Not IsNumeric

Please Help with C# Windows Programming code

I want to search
how to print variable on form VB.NET