why i can't change value of the public variable?

i just want to change value of the public variable that i declared at the main class.
how to change their value when a button clicked?

 

Hi... Post some code. Is this straight asp or asp.net?

 

I suppose you are refering to asp.net so you should add a click handler to the button and in the function (button click handler) you set the value of the variable as you wish.