Multiple formatExeption

[hadinatayp]

i have to validate input for number (integer type) and price (double type),

i would code something like,

------------------------------------------
dim tempNumber as integer
dim tempPrice as double

try

tempNumber=convert.toint32(txtnumber.text)
tempPrice=convert.todouble(txtprice.text)

catch ex as formatException
messagebox.show("Error Number input")
txtnumber.focus()
end try
----------------------------------------

if i enter a string in the Number textbox the try block will catch the exception and display the error message (for the number), same thing will happend if i put a string in price textbox (suppose i enter an integer in the number textbox) (the message will show up stating error in number textbox)

the problem is how make a new exception that catch the double format exception and show the appropriate error message (for the price textbox)

thanks.

 

[vis781]

Don't, throwing exceptions is an expensive process and should be avoided. The Textbox raises a validation event. So you can check the format of the text entered. Then cancel the event and display a messagebox if it doesn't match the fomat you require.

 

[hadinatayp]

Thanks, vis781 !!
Now i know how to use the control's causesValidations method.