How to Validate the Data while entering Data into textbox only for numeric values

[robintwos]

Hi

I would like to validate the while entering the data in a textbox for numeric values.
it means . i would like to throw an error message when the user enters a character value. validation should happen while entering it self .

I am looking for the piece of code in VB.NET. Please do help me

Thanks

[dip_developer]

Hi

I would like to validate the while entering the data in a textbox for numeric values.
it means . i would like to throw an error message when the user enters a character value. validation should happen while entering it self .

I am looking for the piece of code in VB.NET. Please do help me

Thanks

just write a function like the following

[CODE=vbnet]
Private Function checkForNumeric Input(ByVal e As System.Windows. Forms.KeyPressE ventArgs)
If Not (Char.IsDigit(e .KeyChar) Or Char.IsControl( e.KeyChar) ) Then
e.Handled = True
MsgBox("Please Input Numbers Only", MsgBoxStyle.Cri tical)
End If
End Function
[/CODE]

[robintwos]

Hi Thanks for ur code .. I can enter "." also . so i modified the code to allow "." But now i am able to enter "." multiple times .. its an amount field and "." should be entered only once.

[debasisdas]

Hi Thanks for ur code .. I can enter "." also . so i modified the code to allow "." But now i am able to enter "." multiple times .. its an amount field and "." should be entered only once.

Try to solve that yourself refering the sample provided by our expert in the previous post.

[dip_developer]

rightly said by debasisdas...pl ease try it yourself for your betterment..... .i hope you can do....its fairly easy to validate multiple dots....put your brain....

[robintwos]

Thanks for the replies . I solved it my self . I publish my questions here as i started learning .NET newly. Sorry if you people think , i am asking very much basic doubts. I'm learning it on my own. i dont know much in VB.NET.

[hellogohel]

Private Sub MyTextbox_KeyPr ess(ByVal sender As Object, ByVal e As System.Windows. Forms.KeyPressE ventArgs) Handles MyBase.KeyPress
If Char.IsDigit(e. KeyChar) = True Or e.KeyChar = Chr(Keys.Back) Then
Exit Sub
Else
e.Handled = True
MessageBox.Show ("PLEASE ENTER ONLY NUMERIC VALUE.")
End If
End Sub