How Do I Use Random Numbers With 2 Buttons

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C#

So were making a program that involves doing math with radio buttons. The part I'm lost on is we have 2 sets of radio buttons, a label, a text box, and 2 buttons. the first radio buttons set up wether the problem will be addition, subtraction, or multiplication. The second set chooses a range of either 1-12 or 1-24. Based on those 2 choices the first button generates a problem with 2 random numbers within the proper range, and creates a math equation of the correct format. The user then solves the problem, placing the answer in the text box. The last button then checks the answer and tells the user if their right or wrong.

I started with doing an if statement for the addition radio button and nested an if else statement inside of it for the range. I then created the variables x, y, and z as integers in this class. x and y are random numbers within the range and z is the addition of them. I then copied, pasted, and edited for multiplication and subtraction. So my random variables are set and the computer has solved the problem. But i create a new class when i start coding for the "Check Answer" Button. My problem is i can't reference those random numbers to check with their input. Any tips on how to do this?

A copy of what the final project is supposed to look like can be found here: http://jbwyatt.com/202/a/a4/a4Math.html[^]

Also i can put up the code if someone tells me how. Sorry for any confusion, this is my first post here.

Edit:

Here is an example of the code

private void btnNewProblem_Click(object sender, EventArgs e)
       {
           int x, y, z;
           Random rnd = new Random();
           if (radAddition.Checked == true)
           {
               if (radSmallRange.Checked == true)
               {
                   x = rnd.Next(0, 13);
                   y = rnd.Next(0, 13);
               }
               else
               {
                   x = rnd.Next(0, 25);
                   y = rnd.Next(0, 25);
               }
               z = x + y;
               lblProblem.Text = x + " + " + y + " = ";
           }
private void btnCheckAnswer_Click(object sender, EventArgs e)
       {
           try
           {
               int Answer = int.Parse(txtAnswer.Text);
           }
           catch
           {
               MessageBox.Show("Please Enter a Whole Number", "Invalid Entry");
           }


       }

Im trying to use the "z" variable in both button events. And since its dealing with random numbers, I need to reference the variable in both btnNewProblem and btnCheckAnswer. I need to Fetch the value for z created in btnNewProblem and compare it to the users input when btnCheckAnswer is clicked