get gui.button to change value of int on click

so i have created a gui button through script and when i click that button i want it to add 10$ for example
and i am coding in c#

if(gui.button(some rect some location)){
money +=10;
}

this is basically what i have and cant seem to get it to work but if i try and make it a bool and make it true and have an if statement in a different spot it does not work through the gui.button but if make pressing space bar change the bool to true it will add the 10$

this does not work
if(gui.button(some rect some location)){
addmoney = true;
}

but this works
if (input.getkeydown ("space")){
addmoney = true;
}

void update{
if (addmoney = true){
money +=10;
}
}

so after figuring out that i know the adding money part works fine but how come using the gui.button to set bool true does not work?
and to make my button enabled i have a bool that needs to be changed to true and that works fine and if i click the button and have an ifstatement making the bool false it will disable the button. so i know the bool can be changed via gui button but i cant seem to find out why the add money bool wont work with the gui button.

sorry for the bad grammar.

 

Would be easier to just call a function on click:

Code (CSharp):

1.  
2. if(gui.button(some rect some location)){
3. AddMoney(10); // call this function to add the amount
4. }
5.  

then have that function somewhere

Code (CSharp):

1.  
2. void AddMoney(int amount)
3. {
4.  money+=amount; // adding is done here
5. }
6.  

 

ive tried that and still does not work when i click on the gui button.