Csharp Articles - Page 133 of 258

Asynchronous programming in C# is an efficient approach towards activities blocked or access is delayed. If an activity is blocked like this in a synchronous process, then the complete application waits and it takes more time. The application stops responding. Using asynchronous approach, the applications continues with other tasks as well.An application with a GUI, check the content of the queue and if an unprocessed task is there, it takes it out and processes it first. The code executes synchronously and the unprocessed task is completed first. The application will show stop responding messages if the processing takes more time ... Read More

C# exceptions are represented by classes. The exception classes in C# are mainly directly or indirectly derived from the System.Exception class. Some of the exception classes derived from the System.Exception class are the System.ApplicationException and System.SystemException classes.System.DivideByZeroException is a class that handles errors generated from dividing a dividend with zero.Example Live Demousing System; namespace ErrorHandlingApplication {    class DivNumbers {       int result;       DivNumbers() {          result = 0;       }       public void division(int num1, int num2) {          try {         ... Read More

ConstConstant fields are the fields that cannot be modified. At the time of declaration, you need to assign a value to it.const int a = 5;StaticIf the static modifier is applied to a class then you cannot instantiate the class using the new keyword. You can use the static keyword on methods, properties, classes, constructors, etc.static int a = 10;ReadonlyA Readonly field is initialized at the time of declaration or you can also set it within the constructor.Let us see an example in which the readonly field is initialized inside the constructor.Exampleclass Demo {    readonly int a;    public ... Read More

Use the System.IO.Compression Namespace in C# to compress and decompress files in C#.CompressTo zip a file, use the GZipStream class with the FileStream class. Set the following parameters: File to be zipped and the name of the output zip file.Here, outputFile is the output file and the file is read into the FileStream.Exampleusing(var compress = new GZipStream(outputFile, CompressionMode.Compress, false)) {    byte[] b = new byte[inFile.Length];    int read = inFile.Read(b, 0, b.Length);    while (read > 0) {       compress.Write(b, 0, read);       read = inFile.Read(b, 0, b.Length);    } }DecompressTo decompress a file, use ... Read More

We have taken the number as the following −uint a = 9; uint b = 8;Above, a is a divisor and b is dividend.To compute modulus division.Example Live Demousing System; class Demo {    static uint display( uint a, uint b) {       return ( a & (b-1) );    }    static public void Main () {       uint a = 9;       uint b = 6;       Console.WriteLine( a + " modulus " + b + " = " + display(a, b));    } }Output9 modulus 6 = 1

To define the scope and visibility of a class member, use an access specifier. C# supports the following access specifiers. Public Private Protected Internal Protected internal Let us learn about them one by one. Public Access Specifier It allows a class to expose its member variables and member functions to other functions and objects. Private Access Specifier Private access specifier allows a class to hide its member variables and member functions from other functions and objects. Only functions of the same class can access its private members. Protected Access Specifier Protected access specifier allows a child class to ... Read More

The "is" operator in C# checks whether the run-time type of an object is compatible with a given type or not.The following is the syntax.expr is typeHere, expr is the expressiontype is the name of the typeThe following is an example showing the usage of is operator in C#.Exampleusing System; class One { } class Two { } public class Demo {    public static void Test(object obj) {       One x;       Two y;       if (obj is One) {          Console.WriteLine("Class One");          x = (One)obj; ... Read More

To compare enum members, use the Enum.CompareTo() method.Firstly, set the values for students.enum StudentRank { Tom = 3, Henry = 2, Amit = 1 };Now use the compareTo() method to compare one enum value with another.Console.WriteLine( "{0}{1}", student1.CompareTo(student2) > 0 ? "Yes" : "No", Environment.NewLine );The following is the code to compare enum members in C#.Example Live Demousing System; public class Demo {    enum StudentRank { Tom = 3, Henry = 2, Amit = 1 };    public static void Main() {       StudentRank student1 = StudentRank.Tom;       StudentRank student2 = StudentRank.Henry;       StudentRank ... Read More

string keyword Use the string keyword to declare a string variable. The string keyword is an alias for the System.String class. For example. string name; name = "Tom Hanks"; Another example. string [] array={ "Hello", "From", "Tutorials", "Point" }; char keyword The char keyword is used to set array of characters. For example. char[] ch = new char[2]; ch[0] = 'A'; // Character literal ch[1] = 'B'; // Character literal Another example. char []letters= { 'H', 'e', 'l', 'l','o' };

Firstly, set the string to be checked.string s = "timetime";Now set two counters for two halves of the string.int []one = new int[MAX_CHAR]; int []two = new int[MAX_CHAR];Check for both the halves of the string.for (int i = 0, j = l - 1; i < j; i++, j--) {    one[str[i] - 'a']++;    two[str[j] - 'a']++; }The following is the complete code to check whether both the halves of the string have same set of characters or not in C#.Example Live Demousing System; class Demo {    static int MAX_CHAR = 26;    static bool findSameCharacters(string str) {   ... Read More