Validating user entry in a textbox

[Elena]

I am trying to validate two textboxes to make sure that the entries are numeric. I am using the Validate Event of each of the text boxes. If the entry is not numeric, I set e.Cancel = True. I assumed that that would cancel any events that follow.

If I tab to another control, or click a button it works fine. If I click on a radio button that has code in its Click Event to use the numbers, the program bombs with unhandled exception error. The code in the validate event runs, but the code following also runs. Why?

Thanks,
Elena Quinn

 

[SqueakinSweep]

Just a thought....

Even though the Textbox contains numbers, it it is still a character string. Are you remembering to convert the text back to a number.

dim i as Integer = 0
dim d as Double = 0
if isnumeric(txtBox.text) then i = cint(txtBox.text)
if isnumeric(txtBox.text) then d = cdbl(txtBox.text)



Sweep
...if it works dont mess with it

 

[Elena]

Sweep,

Thanks for the reply. If I enter numbers, everything works fine. I am using using Cdbl() to convert the text to numeric and do all the math function. The problem is that I want to prevent the user from entering text.

Thanks,

Elena

 

[benlinkknilneb]

In the TextBox_KeyDown() event, check to see if the key is a digit. If not, set e.Handled to True and the Box should ignore the event.

Ben

There's no place like 127.0.0.1.