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C# calculator

I am working on using the below scenarios...just so you get an idea of the results I am wanting...need some idea of how to get these results. The && sign is not working (I get an error) not sure how to make these work so I can do the calculations needed. Basically it boils down to if the item price is less than 100 and the discount indicator sum is greater than 3, it is given a 20% discount, if price is between 100 and 149.99 and the discount indicator is given a 25% discount, however, if the item is above 149.99 and the sum is greater than 3, it gets a $30.00 discount. If sum of discount indicators is less than 3 then it is a 0% discount. I have everything working except the below scenario and cannot figure it out....the value 69 is 1 for less than 100, 2 for 100  149.99 and 3 for above 149.99. Please help!!
if(sum1>3 and value69=1)
result20= .20
textBox20.Text = result20.ToString();
if (sum20 < 3)
result20 == 0;
textBox20.Text = result20.ToString();if (sum20 > 3) and(value69 == 2);
result20 == 0.25;
textBox20.Text = result20.ToString();if (sum20 > 3) and(value69== 3);
result20 == 30.0;
textBox20.Text = result20.ToString();Can the word "and" be used here or what is the best way to set up this scenario?
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1. You should use && operator.
If you get an error  show us the error that you get.
2. You have an error:
if(sum1>3 and value69=1)
You need to have two == in order to compare in c#.
3. Your scenario looks like a classic case to use the switch statement.
Noam B.
Do not Forget to Vote as Answer/Helpful, please. It encourages us to help you... 
Something like this may help.
if (sum20 < 3) {
result20 = 0;
} else {
if(value69 == 1) result20 = 0.20;
if(value69 == 2) result20 = 0.25;
if(value69 == 3) result20 = 30.0;
}
textBox20.Text = result20.ToString();I assume that result20 should be set from value69 when it is 3 (your code deals with < and > but not =).
Is your last value (30.0) right (others are fractions)?
PS Noam's suggestion about switch is worth looking at  looks a good case for it.
Regards David R

The great thing about Object Oriented code is that it can make small, simple problems look like large, complex ones.
Objectoriented programming offers a sustainable way to write spaghetti code.  Paul Graham.
Every program eventually becomes rococo, and then rubble.  Alan Perlis
The only valid measurement of code quality: WTFs/minute. Edited by Riced Monday, April 22, 2013 4:20 PM Added PS


