What is ADO.NET?What are the key components of ADO.NET?What are the ADO.NET namespaces?What is the meaning of object pooling?What are the differences between ADO.NET and classic ADO?Explain the architecture of ADO.NET.?What is a Connection String in ADO.NET C#??How do you establish a database connection using ADO.NET?Explain the concept of Connection Pooling in ADO.NET C#.Differentiate between Object pooling and Connection pooling in C#?What is a DataReader in ADO.NET? Explain with C# example?What is the functionality of CommandBehavior.SchemaOnly?Why CommandBehavior.SingleResult flag is used in ADO.NET?What does CommandBehavior.SingleRow do in ADO.NET?How we can get multiple results by DataReader using same connection in C#?How can we force the connection object to close after my DataReader is closed?What is a DataSet in ADO.NET? Explain with C# example?What are typed and un-typed datasets in ADO.NET C#?Write down some of the characteristic of DataSet?What is the difference between dataSet and DataReader?Why is DataSet Slower than DataReader? Explain with Example.How does DataSet handle data in a disconnected environment?What is the Difference between connected and disconnected architectire?Explain HasChanges() method of DataSet in C#.Explain GetChanges() method with detaild C# Example.Explain RejectChanges() method with C# Example.Explain AcceptChanges() method with C# Example.What are the various methods provided by DataSet for XML in C#?What is the purpose of DataAdapter in ADO.NET?Explain the steps involved in retrieving data using DataAdapter.
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What is the purpose of DataAdapter in ADO.NET?

The purpose of a DataAdapter in ADO.NET is to establish a bridge between a DataSet and a data source, allowing data to be exchanged between the two. It provides the functionality to fill a DataSet with data from a data source and update the data source with changes made to the DataSet.

Here's a C# example that demonstrates the usage of a DataAdapter:


using System;
using System.Data;
using System.Data.SqlClient;

class Program
{
    static void Main()
    {
        // Connection string for the database
        string connectionString = "YourConnectionString";

        // SQL query to retrieve data
        string query = "SELECT * FROM Customers";

        // Create a DataSet and a DataAdapter
        DataSet dataSet = new DataSet();
        SqlDataAdapter dataAdapter = new SqlDataAdapter(query, connectionString);

        // Open the connection and fill the DataSet with data
        dataAdapter.Fill(dataSet, "Customers");

        // Display the data
        DataTable dataTable = dataSet.Tables["Customers"];
        foreach (DataRow row in dataTable.Rows)
        {
            Console.WriteLine("ID: {0}, Name: {1}", row["ID"], row["Name"]);
        }

        // Modify the data in the DataSet
        DataRow firstRow = dataTable.Rows[0];
        firstRow["Name"] = "Updated Name";

        // Update the changes back to the database
        dataAdapter.Update(dataSet, "Customers");

        Console.WriteLine("Data updated successfully.");
    }
}

In this example, we create a DataSet and a DataAdapter. We provide a SQL query and a connection string to the DataAdapter constructor. Then, we call the Fill method of the DataAdapter to retrieve data from the database and populate the DataSet with the result set.

We display the retrieved data from the DataSet. Next, we modify one of the rows in the DataTable of the DataSet.

To update the changes back to the database, we call the Update method of the DataAdapter, passing in the DataSet and the name of the DataTable that contains the modified data. The DataAdapter uses the provided update command to apply the changes to the database.

Finally, we print a message to indicate that the data has been successfully updated.

The DataAdapter simplifies the process of interacting with a data source and managing the synchronization between the DataSet and the data source. It handles tasks such as populating the DataSet, tracking changes, and applying updates to the data source, making it a convenient component of ADO.NET for working with data.

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