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    <p>The decimal type (.NET 2.0 and later) retains significant trailing zeroes that are the result of a calculation or as a result of parsing a string. E.g. 1.2 * 0.5 = 0.60 (multiplying two numbers accurate to one decimal place gives a result accurate to 2 decimal places, even when the second decimal place is zero):</p> <pre><code>decimal result = 1.2M * 0.5M; Console.WriteLine(result.ToString()); // outputs 0.60 </code></pre> <p>The following assumes you want to consider all significant digits in your decimal value, i.e.</p> <pre><code>decimal d = 1.2349M; // original 1.2349; d = IncrementLastDigit(d); // result is 1.2350; d = IncrementLastDigit(d); // result is 1.2351; (not 1.2360). </code></pre> <p>However if you want to first remove trailing zeroes, you can do so, e.g. using the technique <a href="https://stackoverflow.com/questions/2143060/how-can-i-have-decimal-tryparse-parse-0-0/2145288#2145288">in this answer</a>.</p> <p>There's nothing built-in to do this. You'll have to do it yourself by (a) determining how many digits there are after the decimal, then (b) adding the appropriate amount.</p> <p>To determine how many digits there are after the decimal, you can either format as a string, then count them, or more efficiently, call decimal.GetBits(), the result of which is an array of four integers that contains the scaling factor in bits 16-23 of the fourth integer.</p> <p>Once you have that you can easily calculate the required value to add to your decimal value.</p> <p>Here's an implementation that uses GetBits, which "increments" away from zero for negative numbers IncrementLastDigit(-1.234M) => -1.235M.</p> <pre><code>static decimal IncrementLastDigit(decimal value) { int[] bits1 = decimal.GetBits(value); int saved = bits1[3]; bits1[3] = 0; // Set scaling to 0, remove sign int[] bits2 = decimal.GetBits(new decimal(bits1) + 1); bits2[3] = saved; // Restore original scaling and sign return new decimal(bits2); } </code></pre> <p>Or here's an alternative (perhaps slightly more elegant):</p> <pre><code>static decimal GetScaledOne(decimal value) { int[] bits = decimal.GetBits(value); // Generate a value +1, scaled using the same scaling factor as the input value bits[0] = 1; bits[1] = 0; bits[2] = 0; bits[3] = bits[3] &amp; 0x00FF0000; return new decimal(bits); } static decimal IncrementLastDigit(decimal value) { return value &lt; 0 ? value - GetScaledOne(value) : value + GetScaledOne(value); } </code></pre>
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