re: Need help on C# problem

All of your code to prompt the user, store the values and check that the weights are valid should be inside of your loop.

do
{
Prompt user
If( value <> 0)
{
store value
prompt for after weight
while(weight is invalid)
{
Prompt user for valid weight
}
}
else
{
Print out summary
}
}
while(value <> 0)