Well, if you've never set up a Windows Form for the first time, I'm sure there are better tutorials out there, because unless you do find one, this may as well be Greek (no offence to my Greek friends)
In Essence, if you can get the form in 'design' view/mode in front of you, you
a) drag a label from the tools pallette onto the form
b) change the label to (for example) 'X'
c) drag a textbox onto the form to the right of the label
d) change the textbox name to (for example) value_x
e) repeat a-d for 'Y' & 'Z' and value_y, value_z, aligning the labels/textboxes as you see fit
f) drag a button from the tools palette onto the textbox
g) add an event to the button - lets call it button1_click
h) in the button1_click handler, you read the value of the textboxes, ie
string xText = value_x.Text;
string yText = value_y.Text;
string zText = value_z.Text;
i...) convert the xText... values to integer etc and use them
as I said, you need to find some tutorials .. these links 'may' help
Step 1: Create a Windows Forms Application Project[
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Getting Started with Windows Forms using Visual C# | Holowczak.com[
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