Hardcoding the values

Now, back in Default.aspx, go to the Design view and double-click on the Exchange and Compare button. All we will do is to hardcode the values to save time. We don't have to read them from the user. Of course, you can, if you want to, by putting in two boxes and process that using double convert.

Now, in Default.aspx.cs, between a set of curly braces below the line beginning with protected void Button1_Click..., enter the following lines:

double x = 25, y = 34;

Then use sampLabel.Text to display the original values on this screen, first displaying the value of x and then displaying the value of y:

sampLabel.Text = $"x={x}, y={y}";

Next, to do the swapping of the values. Enter the following:

GenMethods.Swap<double>(ref x, ref y);  

First, you enter the name of class and then the function, which is Swap. You will see that <T> can now be replaced with <double>, because we are swapping doubles. Then, you'll put in ref x and ref y.

Because we are using ref, the values of x and y have to be initialized and further now we can display them again, but swapped, as shown here:

sampLabel.Text += $"<br>x={x}, y={y}";