string fox; fox.ToLower () to lowercase letters fox.ToUpper() converted to uppercase fox.Trim () removes the before and after Spaces fox.Trim (trimChars) deletes other characters fox.TrimStart () removes the preceding space fox.TrimEnd () delete the space after fox. PadLeft(10) adds a space on the left to bring the string up to a certain length. fox. PadRight(10) adds the right space to bring the string up to a certain length. fox.PadX (10,’-’) adds other characters to the string to reach a certain length. X refers to: Left/Right fox.Split (”) breaks a string into an array

System. Text. Encoding. Default. GetByteCount (fox); Get the length of the string, 1 character is equal to 2 characters

// get the location code of Chinese characters byte[] array = new byte[2]; array = System. Text. Encoding. Default. GetBytes (” b ”);

int i1 = (short)(array[0] - ‘\0’); int i2 = (short)(array[1] - ‘\0’);

//unicode code in decoding mode array = System. Text. Encoding. Unicode. GetBytes (” b ”); i1 = (short)(array[0] - ‘\0’); i2 = (short)(array[1] - ‘\0’);

//unicode is decoded into 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);

//default mode is decoded into Chinese characters array[0] = (byte)196; array[1] = (byte)207; s = System.Text.Encoding.Default.GetString(array);