Design And Validation Form ASP.Net

  On this thread i want to share ASP.Net tutorial about Validation Form, follow 
the tutorial carefully :)

1. Make a New Project, choose Windows Forms Application, give it name FormVal 
   or whatever do you want, locate it on your folder project.


2. On Left side you'll see the Toolbox and add any components: Label, TextBox,
   Button, ProgressBar and ErrorProvider.


3. And then we'll inputing scripts inside Button, with Right Click it and 
   Choose View Code or F7.



4. Write this scripts inside button Execute :


5. Try to input with complete:


6. But when you not complete the inputing you'll get the notice


//Explaning about the Scripts:


- decimal NIS;
decimal mean the input only for Numbers, NIS is a name of variable
string inside setError mean for notice when error input, like