Can we validate a DropDownList by RequiredFieldValidator?
Yes, we can validate a DropDownList by RequiredFieldValidator. To perform this validation, we have to set the InitialValue property of RequiredFieldValidator control.
What is the difference between the Response.Write() and Response.Output.Write() methods?
The Response.Write() method allows you to write the normal output; whereas, the Response.Output.Write() method allows you to write the formatted output.
How to implement singleton design pattern in C#?
In singleton pattern, a class can only have one instance and provides access point to it globally.Eg:[csharp]Public sealed class Singleton{Private static readonly Singleton _instance =...
Why can’t you specify the accessibility modifier for methods inside the interface?
In an interface, we have virtual methods that do not have method definition. All the methods are there to be overridden in the derived class....
What are delegates?
Delegates are same are function pointers in C++ but the only difference is that they are type safe unlike function pointers. Delegates are required because...
List down the commonly used types of exceptions in .Net?
ArgumentException ArgumentNullException ArgumentOutOfRangeException ArithmeticException DivideByZeroException OverflowException IndexOutOfRangeException InvalidCastException InvalidOperationException IOEndOfStreamException NullReferenceException OutOfMemoryException StackOverflowException etc.
What are generics in C#.NET?
Generics are used to make reusable code classes to decrease the code redundancy, increase type safety and performance. Using generics, we can create collection classes....
What’s the difference between the System.Array.CopyTo() and System.Array.Clone() ?
Using Clone() method, we creates a new array object containing all the elements in the original array and using CopyTo() method, all the elements of...
What are the differences between System.String and System.Text.StringBuilder classes?
System.String is immutable. When we modify the value of a string variable then a new memory is allocated to the new value and the previous...
What are Custom Control and User Control?
Custom Controls are controls generated as compiled code (Dlls), those are easier to use and can be added to toolbox. Developers can drag and drop...