Software development

1. object,var,dynamic can store any type of value.object and dynamic no need to initilize at the time of declaration but var should be initilize at the time of declaration. 2. object is not type safe because compiler has little information about type. dynamic is not type safe because compiler does not have any information about type. var is type safe beacuse compiler have all information about stored value. 3. object and dynamic can be passed as method arguments and also a method can return object ,dynamic type. but var can't be pass as method arguments and also no method can return var type.

Controls have different default values for the HorizontalContentAlignment and VerticalContentAlignment properties. Default values for HorizontalContentAlignment / VerticalContentAlignment for the most common controls are listed below. Button – Center, Center Calendar – Left, Top CheckBox – Left, Top ComboBox – Left, Top ContextMenu – Left, Center DataGrid – Left, Top DatePicker – Stretch, Top Expander – Stretch, Stretch GroupBox – Left, Top Label – Left, Top ListBox – Left, Center Menu – Left, Top PasswordBox – Left, Top ProgressBar – Left, Top RadioButton – Left, Top RepeatButton – Center, Center RichTextBox – Left, Top Slider – Left, Top StatusBar – Left, Top TabControl – Center, Center TextBox – Left, Top TreeView – Left, Center

Namespaces in C# are used to organize classes.To access the class of a namespace, we need to use namespacename.classname. namespace is designed for providing a way to keep one set of names separate from another. The class names declared in one namespace does not conflict with the same class names declared in another. To define a namespace we need to use "namespace". eg.   namespace NamespaceName  {       class className      {      }  }   namespace WpfWorld Namespace  {       class WpfWorld      {      }  } if we want to use  WpfWorld class in another class then we have to add  WpfWorld Namespace to that class by using Keyword. using  WpfWorld Namespace;   namespace Ex Namespace  {       class Ex      {        var obj WpfWorld = new  WpfWorld();      }  }

Sealed class is a class that prevents the class from being inherited by other class.Sealed class can have Sealed Methods.Sealed method can't be override.To create a Sealed class we need to add Sealed modifier before class keywords. eg. sealed class MySealedClass { } Sealed class can be a derived class but can't be a base class.A sealed class cannot be an abstract class. Because abstract class has to provide functionality and here we are restricting it to inherit. One of the best usage of sealed classes is when you have a class with static members.

C# is used for many reasons, but the benefits of the Microsoft CLR tool set and a large developer community are two main draws to the language. C# is one of several programming languages that target the Microsoft CLR , which automatically gives it the benefits of cross-language integration and exception handling, enhanced security , a simplified model for component interaction, and debugging and profiling services. The strict type checking in C#, both at compile and run times, results in the majority of typical C# programming errors being reported as early as possible.In C# programming, however, that decision is made by the programmer who wrote the object, not by the programmer who instantiates the object and assigns it to a variable.