C # string problem (transcription)

String. Empty! = Null;
If a TextBox has no value, if (TextBox. Text = String. Empty) ==> the result is: FALSE
If (TextBox. Text = String. Empty) => the result is: TRUE;

If the String is null in 2.0, String. IsNullOrEmpty (str) = True indicates that the String is null (null and "");

Note: "=" can only determine whether the "references" of two strings are the same;
To confirm whether the two strings are the same, use Equals.
Example:
String STR = "Sss"; // STR cannot be null. It can be "";
String STRs = NULL;
Str. Equals (STRs) = false;
If STR = "";
Str. Equals (STRs) = false;

// Obtain the location code of Chinese Characters
Byte [] array = new byte [2];
Array = System. Text. Encoding. Default. GetBytes ("ah ");

Int i1 = (short) (array [0]-'\ 0 ');
Int i2 = (short) (array [1]-'\ 0 ');

// Chinese character codes in unicode decoding mode
Array = System. Text. Encoding. Unicode. GetBytes ("ah ");
I1 = (short) (array [0]-'\ 0 ');
I2 = (short) (array [1]-'\ 0 ');

// Unicode deserialization for Chinese Characters
String str = "4a55 ";
String s1 = str. Substring (0, 2 );
String s2 = str. Substring (2, 2 );

Int t1 = Convert. ToInt32 (s1, 16 );
Int t2 = Convert. ToInt32 (s2, 16 );

Array [0] = (byte) t1;
Array [1] = (byte) t2;

String s = System. Text. Encoding. Unicode. GetString (array );

// Decodes Chinese characters in the default mode
Array [0] = (byte) 196;
Array [1] = (byte) 207;
S = System. Text. Encoding. Default. GetString (array );

// Obtain the string length
S = "iam square gun ";
Int len = s. Length; // will output as 6
Byte [] sarr = System. Text. Encoding. Default. GetBytes (s );
Len = sarr. Length; // will output as 3 + 3*2 = 9

// String Addition
System. Text. StringBuilder sb = new System. Text. StringBuilder ("");
Sb. Append ("I ");
Sb. Append ("am ");
Sb. Append ("square gun ");

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