C# How to convert byte arry to string

Scenario
How to a byte array to a string? The solution is using the 'GetString()' method from the ASCIIEncoding.ASCII object. Be carrefull with this method, it may cause problems if you try to convert something other than English, such as Chinese and other asian languages. In this case, you have to use specific ASCII encoding for that language.
For example, you probably want to use System.Text.Encoding.GetEncoding(1251).GetString(b);
Here, '1251' stands for English. You can choose your own codepage for Encoding or Decoding.

Method
byte[] data = ... ; //whatever it is here
string text1 = System.Text.ASCIIEncoding.ASCII.GetString(data);//Let the ASCIIEncoding handle the convertion
string text2 = System.Text.Encoding.GetEncoding(1251).GetString(data);// 1251 stands for English
string text3 = System.Text.Encoding.GetEncoding(28591).GetString(data);// 28591 stands for Latin
string text4 = System.Text.Encoding.GetEncoding("GB18030").GetString(data);// "GB18030" stands for Simplified Chinese

Convert File Size To Readable Format

Scenario
When we use "Windows + E" to browse files, we will see the file size of each file under the "Details" mode. Every file has a file size, but by default all file sizes are displayed in one unit 'KB'. This makes people difficult to make sense if the file size is greater than 10MB, because you will see a lot of numeric digits before the dot symbol.

Method
The following table is not magic and the issue mentioned above is not hard to solve. Here is a way to convert the file size into human readable format under normal circumstance.

1 KB = 1024 Byte = 1024 Byte
1 MB = 1024 KB = 1024 * 1024 Byte = 1048576 Byte
1 GB = 1024 MB = 1024 * 1024 KB = 1024 * 1024 * 1024 Byte = 1073741824 Byte

To convert the file size you retrieve from the original "File.Length" method, we can use the above table to check the byte count.

Code

Conclusion
As you see, after calling the "GetFileSize" method, it will return a converted format of file size string. The implementation is only a few if statements.
You can copy & modify the above code for your convenience.

C# Convert string to double array

Scenario
How to convert a string or a string array into a double array?
The .NET does not provide any method for us to call directly. However this is easy to implement within just a couple lines of code.

Method
//str is the input string that contains a sequence of numbers
string[] arrString = str.Split(new char[] { ' ' });//you can define your own way to split the string
double[] arrDouble = new double[arrString.Length];
for (int i = 0; i < arrString.Length; i++)
{
arrDouble[i] = double.Parse(arrString[i]);
}