C# Programming Basics
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Questions and Answers

What is the correct way to set a timeout value of 1000 milliseconds for myHttpClient?

  • myHttpClient.Timeout.New(1000);
  • myHttpClient.Timeout = TimeSpan.FromMilliseconds(1000); (correct)
  • myHttpClient.Timeout.Set(1000);
  • myHttpClient.Timeout.Milliseconds = 1000;

    • Which statement correctly checks if a stream can perform read operations?

  • if (!stream.CanRead) {}
  • if (stream.IsReadable) {}
  • if (stream.CanRead) {} (correct)
  • if (stream.Readable) {}

    • How do you instantiate a new thread to run MethodName?

  • Thread thread = Thread.Create(MethodName);
  • Thread thread = new Thread(MethodName());
  • Thread thread = new Thread(new ThreadStart(MethodName)); (correct)
  • Thread thread = new Thread(MethodName);

    • Which SQL command syntax is used to remove records from a database table?

    <p>string query = 'DELETE FROM TableName WHERE Column = @Condition';</p> Signup and view all the answers

    What is the purpose of the Parameters.AddWithValue method in SQL commands?

    <p>To securely bind variables to the SQL command parameters.</p> Signup and view all the answers

    What method is used to add a parameter to a SqlCommand object?

    <p>cmd.Parameters.AddWithValue()</p> Signup and view all the answers

    Which command is used to delete a database in SQL Server?

    <p>DROP DATABASE DatabaseName;</p> Signup and view all the answers

    What is the purpose of the SqlDataReader class in the provided code?

    <p>To read data from the database</p> Signup and view all the answers

    In the context of exception handling, which block would catch errors during execution?

    <p>catch</p> Signup and view all the answers

    What data structure allows you to add items to one end and remove them from the other?

    <p>Queue</p> Signup and view all the answers

    Study Notes

    Retrieving/Setting Read Timeout

    • Retrieve the timeout value in milliseconds from myHttpClient: int timeout = myHttpClient.Timeout.Milliseconds;
    • Set a timeout of 1000 milliseconds: myHttpClient.Timeout = TimeSpan.FromMilliseconds(1000);

    StreamWriter Initialization

    • Use a using statement to ensure the StreamWriter is disposed of properly:
    using (StreamWriter writer = new StreamWriter("filePath.txt"))
{
    writer.WriteLine("Your text here");
}

    Retrieving Stream Readability

    • Check if the stream (stream) is readable: if (stream.CanRead)
    • Perform read operations if the stream is readable.

    Importing Classes for SQL Server Access

    • Use the System.Data and System.Data.SqlClient namespaces to access MS SQL Server.

    Thread Instantiation

    • Create a new thread: Thread thread = new Thread(new ThreadStart(MethodName));
    • Start the thread: thread.Start();

    Database-Specific Syntax

    • This section outlines database-specific syntax for connecting to a database. Specific commands and setups based on the database system being used (e.g., SQL Server) will be included.

    Connecting to a Database

    • connectionString is used to specify the connection details to a database (e.g., server name, database name, user credentials, and password).
    string connectionString = "Data Source=ServerName;Initial Catalog=DatabaseName;User ID=Username;Password=Password;";
using (SqlConnection connection = new SqlConnection(connectionString))
{
    connection.Open();
    // Perform database operations
}

    SQL Command Syntax

    • 1. Insert: Example INSERT query and parameter handling:
    string query = "INSERT INTO TableName (Column1, Column2) VALUES (@Value1, @Value2)";
using (SqlCommand cmd = new SqlCommand(query, connection))
{
    cmd.Parameters.AddWithValue("@Value1", value1);
    cmd.Parameters.AddWithValue("@Value2", value2);
    cmd.ExecuteNonQuery();
}
    • 2. Update: Example UPDATE query and parameter handling:
    string query = "UPDATE TableName SET Column1 = @Value WHERE Column2 = @Condition";
using (SqlCommand cmd = new SqlCommand(query, connection))
{
    cmd.Parameters.AddWithValue("@Value", value);
    cmd.Parameters.AddWithValue("@Condition", condition);
    cmd.ExecuteNonQuery();
}
    • 3. Delete: Example DELETE query and parameter handling:
    string query = "DELETE FROM TableName WHERE Column = @Condition";
using (SqlCommand cmd = new SqlCommand(query, connection))
{
    cmd.Parameters.AddWithValue("@Condition", condition);
    cmd.ExecuteNonQuery();
}
    • 4. Select: Example SELECT query and result handling (using a SqlDataReader):
    string query = "SELECT * FROM TableName WHERE Column = @Condition";
using (SqlCommand cmd = new SqlCommand(query, connection))
{
    cmd.Parameters.AddWithValue("@Condition", condition);
    using (SqlDataReader reader = cmd.ExecuteReader())
    {
        while (reader.Read())
        {
           // Process each row
        }
    }
}

    SQL Parameter Instantiation

    • Create a parameter object: SqlParameter parameter = new SqlParameter("@ParamName", SqlDbType.Int);
    • Assign a value to the parameter: parameter.Value = 123;

    Dequeue/Enqueue in Queue

    • Create a queue: Queue<int> queue = new Queue<int>();
    • Enqueue an item: queue.Enqueue(10);
    • Dequeue an item: int item = queue.Dequeue();

    Stack Instantiation

    • Create a stack: Stack<int> stack = new Stack<int>();

    Pushing and Popping Items onto a Stack

    • stack.Push(10); // Pushes 10 onto the stack
    • int item = stack.Pop(); // Pops and retrieves an item from the stack

    Calling Stored Procedures

    • Execute a stored procedure similar to SQL commands:
    string storedProc = "StoredProcedureName";
using (SqlCommand cmd = new SqlCommand(storedProc, connection))
{
    cmd.CommandType = CommandType.StoredProcedure;
	cmd.Parameters.AddWithValue("@ParamName", paramValue);
	cmd.ExecuteNonQuery();
}

    Thread and Exception Handling

    • Assigning Thread: 
    Thread thread = new Thread(() =>
{
   // Code to run in the thread
});
thread.Start();
    • Try/Catch Block: 
    try
{
    // Code that might throw an exception
}
catch (Exception ex)
{
    Console.WriteLine($"Error: {ex.Message}");
}

    SQL Server Database Management

    • Deleting a database: DROP DATABASE DatabaseName;
    • Creating a database: CREATE DATABASE DatabaseName;

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    Event-Driven Programming Syntax PDF

    Description

    Test your knowledge on essential C# programming concepts, including timeout settings, file writing, stream operations, and SQL Server access. The quiz covers various practices for managing threads and database-specific syntax. Enhance your coding skills with this comprehensive assessment.

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