Server Side Programming Articles - Page 2018 of 2646

To check whether an element is contained in the ArrayList, the code is as follows −Example Live Demousing System; using System.Collections; public class Demo {    public static void Main(){       ArrayList list = new ArrayList();       list.Add("One");       list.Add("Two");       list.Add("Three");       list.Add("Four");       list.Add("Five");       list.Add("Six");       list.Add("Seven");       list.Add("Eight");       Console.WriteLine("ArrayList elements...");       foreach(string str in list){          Console.WriteLine(str);       }       Console.WriteLine("ArrayList is read-only? = "+list.IsReadOnly);     ... Read More

To check whether a Hashtable contains a specific key or not, the code is as follows −Example Live Demousing System; using System.Collections; public class Demo {    public static void Main(){       Hashtable hash = new Hashtable();       hash.Add("One", "Katie");       hash.Add("Two", "John");       hash.Add("Three", "Barry");       hash.Add("Four", "");       hash.Add("Five", "Harry");       hash.Add("Six", "F");       hash.Add("Seven", "Tom");       hash.Add("Eight", "Andy");       hash.Add("Nine", "I");       hash.Add("Ten", "Tim");       Console.WriteLine("Hashtable Key and Value pairs...");       foreach(DictionaryEntry ... Read More

To check the HybridDictionary for a specified key, the code is as follows −Example Live Demousing System; using System.Collections; using System.Collections.Specialized; public class Demo {    public static void Main(){       HybridDictionary dict = new HybridDictionary(5);       dict.Add("A", "AB");       dict.Add("B", "BC");       dict.Add("C", "DE");       dict.Add("D", "FG");       dict.Add("E", "HI");       Console.WriteLine("Key/Value pairs...");       foreach(DictionaryEntry d in dict)       Console.WriteLine("Key = "+d.Key + ", Value = " + d.Value);       Console.WriteLine("Does HybridDictionary contains the key C? = "+dict.Contains("C"));    } ... Read More

The Convert Class has methods to convert a base data type to another base data type. Let us see some examples −The Convert.ToBoolean() method in C# is used to convert a specified value to an equivalent Boolean value.SyntaxFollowing is the syntax −public static bool ToBoolean (string val, IFormatProvider provider);Above, Val is a string that contains the value of either TrueString or FalseString, whereas the provider is an object that supplies culture-specific formatting information.ExampleLet us now see an example to implement the Convert.ToBoolean() method − Live Demousing System; using System.Globalization; public class Demo {    public static void Main(){       ... Read More

The Char Struct in C# represents a character as a UTF-16 code unit. Here are some of the methods −MethodDescriptionConvertToUtf32(Char, Char)Converts the value of a UTF-16 encoded surrogate pair into a Unicode code point.ConvertToUtf32(String, Int32)Converts the value of a UTF-16 encoded character or surrogate pair at a specified position in a string into a Unicode code point.Equals(Char)Returns a value that indicates whether this instance is equal to the specified Char object.Equals(Object)Returns a value that indicates whether this instance is equal to a specified object.GetHashCode()Returns the hash code for this instance.GetNumericValue(Char)Converts the specified numeric Unicode character to a double-precision floating-point number.IsDigit(String, ... Read More

To get the standard output stream through Console, the code is as follows −Example Live Demousing System; public class Demo {    public static void Main(string[] args){       Console.WriteLine("Standard Output Stream = "+Console.Out);    } }OutputThis will produce the following output −Standard Output Stream = System.IO.TextWriter+SyncTextWriterExampleTo get the standard error output stream through Console, the code is as follows − Live Demousing System; public class Demo {    public static void Main(string[] args){       Console.WriteLine("Standard Output Stream = "+Console.Out);       Console.WriteLine("Standard Error Output Stream = "+Console.Error);    } }OutputThis will produce the following output −Standard Output ... Read More

To get the largest window height of the Console, the code is as follows −Example Live Demousing System; public class Demo{    public static void Main(string[] args){       Console.WriteLine("Largest Window Height of the Console = "+Console.LargestWindowHeight);    } }OutputThis will produce the following output −Largest Window Height of the Console = 58ExampleTo get the largest window width of the Console, the code is as follows − Live Demousing System; public class Demo{    public static void Main(string[] args){       Console.WriteLine("Largest Window Width of the Console = "+Console.LargestWindowWidth);    } }OutputThis will produce the following output −Largest Window Width of the Console = 190

To get the fourth element of the Tuple, the code is as follows −Example Live Demousing System; public class Demo {    public static void Main(String[] args){       var tuple1 = Tuple.Create(75, 200, 500, 700, 100, 1200, 1500);       var tuple2 = Tuple.Create(75, 200, 500, 700, 100, 1200, 1500);       Console.WriteLine("Is Tuple1 equal to Tuple2? = "+tuple1.Equals(tuple2));       Console.WriteLine("HashCode of Tuple1 = "+tuple1.GetHashCode());       Console.WriteLine("HashCode of Tuple2 = "+tuple2.GetHashCode());       Console.WriteLine("Tuple1 Item 5th = "+tuple1.Item5);       Console.WriteLine("Tuple2 Item 5th = "+tuple2.Item5);       Console.WriteLine("Tuple1 Item 1st ... Read More

To get the number of key/values pairs contained in OrderedDictionary, the code is as follows −Example Live Demousing System; using System.Collections; using System.Collections.Specialized; public class Demo {    public static void Main(){       OrderedDictionary dict = new OrderedDictionary();       dict.Add("A", "Home Appliances");       dict.Add("B", "Electronics");       dict.Add("C", "Smart Wearables");       dict.Add("D", "Pet Supplies");       dict.Add("E", "Clothing");       dict.Add("F", "Footwear");       Console.WriteLine("OrderedDictionary elements...");       foreach(DictionaryEntry d in dict){          Console.WriteLine(d.Key + " " + d.Value);       }     ... Read More

To return fields appearing a certain number of times, the syntax is as follows −select distinct yourColumnName, count(yourColumnName) from yourTableName where yourColumnName LIKE 'J%' group by yourColumnName having count(*) > 1 order by yourColumnName;Let us first create a table −mysql> create table DemoTable1500    -> (    -> Name varchar(20)    -> ); Query OK, 0 rows affected (0.86 sec)Insert some records in the table using insert command −Mysql> insert into DemoTable1500 values(‘Adam’); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable1500 values('John'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable1500 values('Mike'); Query OK, 1 ... Read More