Noob C# programmer needing help

I am currently working on a program that is Event based. (it's a form application)
it is a number guessing game, I'm having no issue creating the random variable, however, Every time I click the button the number changes, I am wondering if there is a way to store the first number that the random number creates. Any help would be greatly appreciated

 

Just above the code that changes the number, store the variable if it's the first as an Integer, alternatively you could store them in an array.

 

int firstnumber;
int isFirstClick = true;
int randomnumber;

private button click event blah blah(){

if (isfirstclick == true)
{
isfirstclick = false;
firstnumber = genRandom();
return;
}

randomnumber = genRandom();

}


Something like that