Category Archives: performance

Use PLINQ to select prime numbers from an array in C#

The example Use PLINQ to select even numbers from an array in C# uses PLINQ (Parallel LINQ) to find the even numbers in an array of random values. This example uses a similar technique to do something slightly more interesting: … Continue reading

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Use PLINQ to select even numbers from an array in C#

This example is really a demonstration of PLINQ, since you probably won’t need to use this technique to find even numbers. (If you do need to generate even numbers, it’s a lot faster and easier to simply pick random numbers … Continue reading

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Use the Stopwatch class to time a program in C#

To measure elapsed time, you can save the current time with DateTime.Now and then compare it to a later time to see how much time has elapsed. The Stopwatch class in the System.Diagnostics namespace makes this a bit easier. It’s … Continue reading

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Remove unnecessary using directives in C#

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

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Efficiently see if a string is blank in C#

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

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Compare performance looping over DateTime and integer variables in C#

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

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Find Friday the Thirteenths in C#

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

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Compare the performance of simple arithmetic operations in C#

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

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

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

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

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

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