Creating validation for user input?

[adi2015]

Hi,

I have 5 fields on my form which I need to validate on lost focus and save button. These fields must be mandatory. Searching through google I have find useful tutorial

Validate user input in Windows Forms - CodeProject

but I don't want to install some "Validator.dll" in order to achieve this, I want to have code on lost focus event and save button. How can I do this for 5 fields?

Any help is appreciated and many thanks in advance!
Adi

 

[JohnH]

Validating event and ErrorProvider component is what you should look at.
User Input Validation in Windows Forms
ErrorProvider Class (System.Windows.Forms)

 

[adi2015]

I solved it like this

if textbox1.text=""then
msgbox "mandatory field!!!"
else
your code

Thank you.
Adi