Category Archives: performance

Remove unnecessary using directives in C#

Posted on September 12, 2017 by Rod Stephens

The top of a C# code file usually includes series of using directives to tell Visual Studio which namespaces are used by the code. When you first create a project, the code files include lots of using directives that might … Continue reading →

Posted in coding, performance | Tagged C#, C# programming, coding, directive, example, example program, performance, using, using directives, Windows Forms programming | Leave a comment

Efficiently see if a string is blank in C#

Posted on September 5, 2017 by Rod Stephens

This example uses three strings to compare different methods for determining whether a string is blank. One of the methods, the string class’s IsNullOrWhiteSpace method, only works in .NET Framework 4.5 or later, so this example targets that version of … Continue reading →

Posted in performance, strings | Tagged blank, blank string, C#, C# programming, CompareTo, empty, example, example program, IsNullOrEmpty, IsNullOrWhiteSpace, performance, string.CompareTo, string.Empty, strings, Windows Forms programming | 5 Comments

Compare performance looping over DateTime and integer variables in C#

Posted on August 14, 2017 by Rod Stephens

The example Find Friday the Thirteenths in C# doesn’t really worry about performance. It uses integers to loop over the dates within a range. For every year between the start and end dates, the code considers the 13th of each … Continue reading →

Posted in performance, syntax | Tagged C#, C# programming, date loop, dates, DateTime, example, example program, Friday the 13th, Friday the Thirteenth, integer, loop, loop over dates, performance, syntax, Windows Forms programming | Leave a comment

Find Friday the Thirteenths in C#

Posted on August 11, 2017 by Rod Stephens

The following code shows how this example lists the Friday the Thirteenths between selected start and end dates. // List Friday the 13ths between the start and end dates. private void btnGo_Click(object sender, EventArgs e) { lstResults.Items.Clear(); // Get the … Continue reading →

Posted in performance, syntax | Tagged C#, C# programming, dates, DateTime, example, example program, Friday the 13th, Friday the Thirteenths, loop over dates, performance, syntax, Windows Forms programming | 1 Comment

Compare the performance of simple arithmetic operations in C#

Posted on May 26, 2017 by Rod Stephens

I saw a post the other day that said division was the slowest arithmetic operation so I wrote this example to see exactly how the performance of multiplication, division, addition, and subtraction differ with floating point numbers. When you click … Continue reading →

Posted in mathematics, performance | Tagged addition, C#, C# programming, division, example, example program, mathematics, multiplication, performance, speed, subtraction, Windows Forms programming | 1 Comment

Compare the performance of the int, long, and byte data types in C#

Posted on May 17, 2017 by Rod Stephens

The example Compare the performance of the float, double, and decimal data types in C# compares the performance of the float, double, and decimal data types. This example performs a similar test for the int, long, and byte data types. … Continue reading →

Posted in performance, variables | Tagged byte, C#, C# programming, example, example program, float, int, long, performance, speed, variables, Windows Forms programming | Leave a comment

Compare the performance of the float, double, and decimal data types in C#

Posted on May 16, 2017 by Rod Stephens

A computer’s math coprocessor typically gives the best performance with a particular data type. To see which works best on my system and to learn how big the difference is, I wrote this program to compare the performance of calculations … Continue reading →

Posted in performance, variables | Tagged C#, C# programming, decimal, double, example, example program, float, performance, speed, variables, Windows Forms programming | 6 Comments

Compare sorting algorithms in C#, article 5 of 5

Posted on April 21, 2017 by Rod Stephens

Countingsort The discussion of Quicksort in my previous post mentions that the fastest possible sorting algorithms that use comparisons take on the order of N * log(N) steps. Countingsort does not use comparisons so it is not bound by that … Continue reading →

Posted in algorithms, performance | Tagged algorithms, Array.Sort, bubblesort, C#, C# programming, countingsort, example, example program, performance, quicksort, selectionsort, sort arrays, sort values, sorting, Windows Forms programming | Leave a comment

Compare sorting algorithms in C#, part 4 of 5

Posted on April 21, 2017 by Rod Stephens

Quicksort Quicksort is a recursive algorithm that uses a divide-and-conquer technique. While the list of items to be sorted contains at least two items, Quicksort divides it into two sublists and recursively calls itself to sort the sublists. The Quicksort … Continue reading →

Posted in algorithms, performance | Tagged algorithms, Array.Sort, bubblesort, C#, C# programming, countingsort, example, example program, quicksort, selectionsort, sort arrays, sort values, sorting, Windows Forms programming | Leave a comment

Compare sorting algorithms in C#, part 3 of 5

Posted on April 20, 2017 by Rod Stephens

Selectionsort Selectionsort is a very simple algorithm. First you search the list for the smallest item. Then you swap that item with the item at the top of the list. Next you find the second smallest item and swap it … Continue reading →