Only accept numerals in imput???

[Imfromtexas]

Im trying to make a set of text box inputs perform calculations, How can I return a msgbox "invalid input" or something of that sort when numerals or symbols are input inplace of a valid number?

 

[Paszt]

It depends on when you want to return that message.
You can always check the TextBox.Text property using the Microsoft.VisualBasic.Information.IsNumeric function; either when the text is validated or when you press a button.
You can also handle the keypress event of the textBox and check whether the key being pressed is a number, if not set the KeyPressEventArgs.Handled (e.Handled) to true which will block the processing of said key. You could subclass the textbox class to create a numeric only textbox using this method.

 

[levyuk]

My solution

[size=2][/size][size=2][color=#0000ff]Private[/color][/size][size=2] [/size][size=2][color=#0000ff]Sub[/color][/size][size=2] TextBoxCompanyID_KeyPress([/size][size=2][color=#0000ff]ByVal[/color][/size][size=2] sender [/size][size=2][color=#0000ff]As[/color][/size][size=2] [/size][size=2][color=#0000ff]Object[/color][/size][size=2], [/size][size=2][color=#0000ff]ByVal[/color][/size][size=2] e [/size][size=2][color=#0000ff]As[/color][/size][size=2] System.Windows.Forms.KeyPressEventArgs) [/size][size=2][color=#0000ff]Handles[/color][/size][size=2] TextBoxCompanyID.KeyPress

[/size][size=2][color=#008000]'Allows only numeric values into the companyID textbox

[/color][/size][size=2][/size][size=2][color=#0000ff]If[/color][/size][size=2] e.KeyChar.IsNumber(e.KeyChar) = [/size][size=2][color=#0000ff]False[/color][/size][size=2] [/size][size=2][color=#0000ff]Then

[/color][/size][size=2]e.Handled = [/size][size=2][color=#0000ff]True

[/color][/size][size=2][/size][size=2][color=#0000ff]End[/color][/size][size=2] [/size][size=2][color=#0000ff]If

[/color][/size][size=2][/size][size=2][color=#0000ff]End[/color][/size][size=2] [/size][size=2][color=#0000ff]Sub[/color][/size]
[size=2][color=#0000ff]

[/color][/size]

 

[Imfromtexas]

Im really new at this so thanks for your help. I tried that and that does not allow the use of a decimal or leave the ability to "backspace" in the cell.
Any other suggestions?
Again thanks for your help.

 

[Imfromtexas]

Mabey this will help im trying to have textbox inputs that will send input values to a dynamic array, so really I just need to validate that the input can be used in a mathmatical equation before its sent to the array. Again im new at this so im not sure if im explaining it correcly, thanks

 

[Imfromtexas]

Or maybe thats not even what i need to do, Maybe you can help me with a better direction. I need to have X sets number of inputs, (user driven) and for each set of inputs I have the same formulas to run across each of them. Any Suggestions would be greatly appreciated.

 

[JuggaloBrotha]

to elaborate on levyuk's post:

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

  'Allows only numeric values into the companyID textbox
  If Asc(e.KeyChar) <> Keys.Back And Asc(e.KeyChar) <> Keys.Decimal Then
	If e.KeyChar.IsNumber(e.KeyChar) = FalseThen
	  e.Handled = True
	End If
  End If
End Sub