Hi there,
How can I create a variable in Windows form which can be used to hold the User-name of the user and can be accessed throughout the application.

Hi

You can define a global variable(I mean define a variable at the beginning of the form's class before all other methods and after the openning brace) and initialize it to null.Then if your application have a button to save the username you can add such a code to the button's click event:
userName=textboxUserName.text;
If your application does not contain such a button,never mind,add the same code to the textbox's TextChanged event.This way,the moment text changed in textbox,it is directly stored in userName.

Hope that hepls..

Erfan

you should create a static and public class in a separate file (because of avoiding nested classes) like this

and you can set MyVariables.Username = "some username"; and access it like:
string username = MyVariables.Username;