C# - Populate A Box When A Box Is Checked?

I have asked this question before but didn't get any help. I am going to try to rephrase it a bit.

I have 5 input boxes; let's call them chck1, chck2, chck3, chck4, and chck5.Each input box has an associated checkbox, let's call them chckbox1, chckbox2, chckbox3, chckbox4, chckbox5. These are in a section called '*Step 3****

THe spec is that if you enter a number into one of the input boxes and check the associated checkbox in Step 3, the number gets populated into the corresponding box in step 4.

For instance, if i check a checkbox called chckbox1 and enter a number into chck1 in step3, that number gets populated into chck_amt in step 4 as long as the checkbox next to the inputbox in step3 is checked.

If a number is entered in any of the boxes in step 3 but the associated checkbox is not checked, the number doesn't get populated into the corresponding box in step4.The issue that I have so far is that if I check a box FIRST before entering a number, the corresponding box in step4 gets populated.

If, however, I enter a number into a box in step3 BEFORE checking the associated checkbox, that number does NOT get populated into the corresponding box in step4.Does anyone know how to ensure that whether a number is entered first in step3 or a box is checked first, as long a box is checked, that number needs to get populated into the corresponding box in step4.

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