Every Question..What does it mean? Why is this? How it works?
Microsoft .Net (pronounced dot (.) net) may be a package element that runs on the Windows software package.
.Net provides tools and libraries that change developers to form Windows package a lot of quicker and easier.
Microsoft describes it as:".Net is that the Microsoft internet Service strategy to attach data, people,
system and devices through software".I'm Choulla Naresh..!
You can use the following query to list all tables in the current database:
SELECT TABLE_NAME
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_TYPE = 'BASE TABLE' AND TABLE_CATALOG = 'YourDatabaseName';
This query returns the names of all base tables in the specified database.
You can check the size of a database using the following query:
EXEC sp_spaceused;
Or, for a specific database:
USE YourDatabaseName;
EXEC sp_spaceused;
SELECT
es.session_id AS SPID,
es.login_name,
es.status,
es.host_name,
es.program_name,
es.database_id,
DB_NAME(es.database_id) AS database_name,
ec.client_net_address,
er.wait_type,
er.wait_time,
er.blocking_session_id
FROM sys.dm_exec_sessions es
LEFT JOIN sys.dm_exec_connections ec ON es.session_id = ec.session_id
LEFT JOIN sys.dm_exec_requests er ON es.session_id = er.session_id
WHERE es.database_id = DB_ID('YourDatabaseName');
------------------------------------------------------------------------------------
kill SSID
If you are getting this error breakpoint in view then there is some error in view or some property name is wrong. Then check and fix all lines. After correction it will work.
Common Causes:
Configuration Errors: Issues in your WCF configuration (e.g., app.config or web.config) could trigger this exception. Check that your configuration files are correctly set up, especially sections related to diagnostics and tracing.
Missing or Corrupt DLLs: If a required DLL (e.g., System.ServiceModel.dll) is missing or corrupt, the type initializer might fail. Ensure that all necessary assemblies are present and correctly referenced in your project.
Permissions Issues: The TraceUtility class may attempt to access system resources, such as event logs or trace files. If the application lacks the necessary permissions, it could cause this exception. Ensure your application has the appropriate permissions to access these resources.
folders named X64 and X86 Copy "SQLite.Interop.dll" to both folders after creating them inside the release or debug folders.
[Deprecation] Listener added for a 'DOMSubtreeModified' mutation event. Support for this event type has been removed, and this event will no longer be fired. See https://chromestatus.com/feature/5083947249172480 for more information.
old code
$('.lg-map-text').bind("DOMSubtreeModified", function () {
if ($('.lg-map-text').text() != "") {
var getHtml = $('.lg-map-text');
var state = getHtml["0"].children[1].value;
if (state != undefined) {
GetDescription(state);
$('html, body').animate({
scrollTop: $('.whitesec').offset().top
}, 800
);
}
}
});
new changes
// Function to be called when the mutation is observed
function onMutation(mutationsList, observer) {
// Iterate through all mutations
for (let mutation of mutationsList) {
// Check if the mutation is a change to the text content
if (mutation.type === 'childList' || mutation.type === 'subtree') {
// Check if the element has text content
if ($('.lg-map-text').text() != "") {
var getHtml = $('.lg-map-text');
var state = getHtml[0].children[1].value;
if (state != undefined) {
GetDescription(state);
$('html, body').animate({
scrollTop: $('.whitesec').offset().top
}, 800);
}
}
}
}
}
// Select the target node
var targetNode = document.querySelector('.lg-map-text');
// Create a new MutationObserver instance and pass the callback function
var observer = new MutationObserver(onMutation);
// Options for the observer (which mutations to observe)
var config = { childList: true, subtree: true };
// Start observing the target node for configured mutations
observer.observe(targetNode, config);
The main differences between an abstract class and an interface in C# are as follows:
1. **Instantiation**: An abstract class cannot be instantiated on its own, while an interface cannot be instantiated at all. Abstract classes are designed to be base classes that provide a common definition for derived classes, while interfaces define a contract that implementing classes must adhere to.
2. **Implementation**: An abstract class can have both abstract and non-abstract methods, allowing it to provide a partial implementation of its members. In contrast, an interface can only have method signatures without any implementation. Implementing classes must provide the implementation for all interface members.
3. **Inheritance**: A class can inherit from only one abstract class, but it can implement multiple interfaces. This allows for a form of multiple inheritance through interfaces, where a class can inherit behavior from multiple sources.
4. **Access Modifiers**: Abstract classes can have access modifiers (e.g., public, private, protected) that provide fine-grained control over their members. Interfaces, on the other hand, have public access by default and cannot specify different access modifiers for their members.
Here's an example to illustrate the difference:
```csharp
// Abstract class
public abstract class Animal
{
public abstract void MakeSound();
public void Sleep()
{
Console.WriteLine("Zzzz...");
}
}
// Interface
public interface IJumpable
{
void Jump();
}
// Derived class implementing an abstract class and an interface
public class Cat : Animal, IJumpable
{
public override void MakeSound()
{
Console.WriteLine("Meow!");
}
public void Jump()
{
Console.WriteLine("Jumping high!");
}
}
// Usage
public static void Main()
{
Cat cat = new Cat();
cat.MakeSound(); // Output: Meow!
cat.Sleep(); // Output: Zzzz...
cat.Jump(); // Output: Jumping high!
}
```
In the example above, the `Animal` class is an abstract class that provides a partial implementation of the `MakeSound` method and a non-abstract `Sleep` method. The `IJumpable` interface defines the `Jump` method. The `Cat` class inherits from the `Animal` class and implements the `IJumpable` interface, providing the necessary implementations for all the inherited members.
I hope this example helps clarify the difference between abstract classes and interfaces in C#. Let me know if you have any further questions!
Nullable types in C# allow value types to represent the normal range of values plus an additional null value. This is particularly useful when dealing with databases and other scenarios where a value might be undefined or missing.
### Key Points about Nullable Types
1. **Definition**:
- Nullable types are instances of the `System.Nullable<T>` structure.
- They can represent all the values of their underlying type `T`, plus an additional `null` value.
2. **Syntax**:
- A nullable type is defined using the `?` syntax after the value type.
```csharp
int? nullableInt = null;
```
3. **Properties and Methods**:
- **HasValue**: Returns `true` if the variable contains a non-null value.
- **Value**: Gets the value if `HasValue` is `true`; otherwise, it throws an `InvalidOperationException`.
```csharp
if (nullableInt.HasValue)
{
int value = nullableInt.Value;
}
```
4. **Null-Coalescing Operator**:
- The `??` operator provides a default value when a nullable type has no value.
```csharp
int value = nullableInt ?? 0; // value will be 0 if nullableInt is null
```
5. **Conversion**:
- Nullable types can be implicitly converted from the underlying type.
- Explicitly converting a nullable type to its underlying type requires checking for null first.
```csharp
int? nullableInt = 5;
int nonNullableInt = (int)nullableInt; // explicit conversion
```
### Example Code
```csharp
using System;
class Program
{
static void Main()
{
// Declaration of a nullable int
int? nullableInt = null;
// Check if it has a value
if (nullableInt.HasValue)
{
Console.WriteLine($"Value: {nullableInt.Value}");
}
else
{
Console.WriteLine("No value");
}
// Assign a value
nullableInt = 10;
// Use the null-coalescing operator
int result = nullableInt ?? 0; // result will be 10
Console.WriteLine($"Result: {result}");
// Convert nullable to non-nullable
if (nullableInt.HasValue)
{
int nonNullableInt = nullableInt.Value;
Console.WriteLine($"Non-nullable int: {nonNullableInt}");
}
}
}
```
### Usage Scenarios
1. **Database Operations**: When retrieving data from a database, columns may contain null values.
2. **Optional Parameters**: When a method parameter is optional and can have no value.
3. **Data Validation**: Representing optional fields in data input forms.
Using nullable types ensures that your code can handle cases where a value might not be available, making it more robust and preventing potential runtime errors related to null values.
In C#, both the `continue` and `break` statements are used to control the flow of loops. However, they serve different purposes and behave differently when executed. Here’s a detailed explanation suitable for an interview:
### `continue` Statement:
The `continue` statement is used within loops to skip the current iteration and proceed to the next iteration.
#### Key Points:
1. **Usage**:
- Typically used when you want to skip the rest of the code inside the loop for the current iteration based on a condition.
- The loop itself does not terminate; it continues with the next iteration.
2. **Behavior**:
- When the `continue` statement is encountered, the control is immediately passed to the next iteration of the loop.
- In `for` loops, the iteration statement is executed before the next iteration.
- In `while` and `do-while` loops, the condition is re-evaluated.
#### Example:
```csharp
for (int i = 0; i < 10; i++)
{
if (i % 2 == 0)
{
continue; // Skip the rest of the loop body for even numbers
}
Console.WriteLine(i); // This line will only execute for odd numbers
}
```
Output:
```
1
3
5
7
9
```
### `break` Statement:
The `break` statement is used to terminate the loop or switch statement immediately.
#### Key Points:
1. **Usage**:
- Typically used when you need to exit the loop based on a condition.
- Can also be used to exit a `switch` statement after a case has been handled.
2. **Behavior**:
- When the `break` statement is encountered, the control exits the loop or switch statement immediately.
- The code following the loop or switch statement is executed.
#### Example:
```csharp
for (int i = 0; i < 10; i++)
{
if (i == 5)
{
break; // Exit the loop when i equals 5
}
Console.WriteLine(i); // This line will execute for i = 0, 1, 2, 3, 4
}
```
Output:
```
0
1
2
3
4
```
### Summary of Differences:
1. **Functionality**:
- `continue`: Skips the current iteration and proceeds with the next iteration.
- `break`: Terminates the loop or switch statement entirely.
2. **Effect on Loop**:
- `continue`: The loop continues running, but the code following the `continue` statement in the current iteration is skipped.
- `break`: The loop stops running, and control is passed to the statement immediately following the loop.
3. **Usage Context**:
- `continue`: Useful when you want to skip specific iterations but continue the loop.
- `break`: Useful when you want to stop the loop entirely based on a condition.
#### Combined Example:
```csharp
for (int i = 0; i < 10; i++)
{
if (i == 5)
{
break; // Exit the loop entirely when i equals 5
}
if (i % 2 == 0)
{
continue; // Skip the rest of the loop body for even numbers
}
Console.WriteLine(i); // This line will only execute for odd numbers less than 5
}
```
Output:
```
1
3
```
By explaining these points clearly, you can effectively demonstrate your understanding of the differences between `continue` and `break` statements in C# during an interview.