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

class ExecuteSelect {
    public static void Main() {
        SqlConnection mySqlConnection = new SqlConnection("server=localhost;database=Northwind;uid=sa;pwd=sa");
        SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
        mySqlCommand.CommandText =
          "SELECT TOP 5 CustomerID, CompanyName, ContactName, Address " +
          "FROM Customers " +
          "ORDER BY CustomerID";

        mySqlConnection.Open();
        SqlDataReader mySqlDataReader = mySqlCommand.ExecuteReader();
        while (mySqlDataReader.Read()) {
            Console.WriteLine("mySqlDataReader[" CustomerID"] = " + mySqlDataReader["CustomerID"]);
            Console.WriteLine("mySqlDataReader[" CompanyName"] = " + mySqlDataReader["CompanyName"]);
            Console.WriteLine("mySqlDataReader[" ContactName"] = " + mySqlDataReader["ContactName"]);
            Console.WriteLine("mySqlDataReader[" Address"] = " + mySqlDataReader["Address"]);
        }
        mySqlDataReader.Close();
        mySqlConnection.Close();
    }
}

    

   


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

class SingleRowCommandBehavior
{
  public static void Main()
  {
    SqlConnection mySqlConnection =new SqlConnection("server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;");

    SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
    mySqlCommand.CommandText ="SELECT ID, FirstName, LastName FROM Employee";

    mySqlConnection.Open();

    SqlDataReader mySqlDataReader = mySqlCommand.ExecuteReader(CommandBehavior.SingleRow);

    while (mySqlDataReader.Read()){
      Console.WriteLine("mySqlDataReader[" ID"] = " +
        mySqlDataReader["ID"]);
      Console.WriteLine("mySqlDataReader[" FirstName"] = " +
        mySqlDataReader["FirstName"]);
      Console.WriteLine("mySqlDataReader[" LastName"] = " +
        mySqlDataReader["LastName"]);
    }

    mySqlDataReader.Close();
    mySqlConnection.Close();
  }
}
           
          

   

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

class PopulateDataSetUsingRange
{
  public static void Main()
  {
    SqlConnection mySqlConnection =new SqlConnection("server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;");

    SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
    mySqlCommand.CommandText =
      "SELECT TOP 5 ID, FirstName, LastName " +
      "FROM Employee " +
      "ORDER BY ID";
    SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
    mySqlDataAdapter.SelectCommand = mySqlCommand;
    DataSet myDataSet = new DataSet();
    mySqlConnection.Open();

    Console.WriteLine("Retrieving rows from the Employee table");
    int numberOfRows = mySqlDataAdapter.Fill(myDataSet, 1, 3, "Employee");
    Console.WriteLine("numberOfRows = " + numberOfRows);

    mySqlConnection.Close();

    DataTable myDataTable = myDataSet.Tables["Employee"];

    foreach (DataRow myDataRow in myDataTable.Rows)
    {
      Console.WriteLine("ID = " + myDataRow["ID"]);
      Console.WriteLine("FirstName = " + myDataRow["FirstName"]);
      Console.WriteLine("LastName = " + myDataRow["LastName"]);
    }
  }
}
           
          

   

/*
 * C# Programmers Pocket Consultant
 * Author: Gregory S. MacBeth
 * Email: gmacbeth@comporium.net
 * Create Date: June 27, 2003
 * Last Modified Date:
 * Version: 1
 */
using System;
using System.Data;
using System.Data.SqlClient;

namespace Client.Chapter_13___ADO.NET
{
    public class FindingRowsInData
    {
        public static void Main()
        {
            SqlConnection MyConnection = new SqlConnection(@"Data Source=(local); Initial Catalog = CaseManager; Integrated Security=true");
            SqlDataAdapter MyDataAdapter = new SqlDataAdapter("SELECT * FROM Test", MyConnection);
            SqlCommandBuilder MyCmd = new SqlCommandBuilder(MyDataAdapter);
            DataSet MyDataSet = new DataSet();

            MyDataAdapter.Fill(MyDataSet);

            DataColumn[] MyKey = new DataColumn[1];

            MyKey[0] = MyDataSet.Tables[0].Columns[0];
            MyDataSet.Tables[0].PrimaryKey = MyKey;

            DataRow FindMyRow = MyDataSet.Tables[0].Rows.Find(1);
        }
    }
}




           
          

/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy

Publisher: Sybex;
ISBN: 0782129110
*/

/*
Example23_1.cs illustrates how to perform a SELECT statement
using ADO.NET
*/

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

public class Example23_1
{

public static void Main()
{

// step 1: formulate a string containing the details of the
// database connection
string connectionString =
“server=localhost;database=Northwind;uid=sa;pwd=sa”;

// step 2: create a SqlConnection object to connect to the
// database, passing the connection string to the constructor
SqlConnection mySqlConnection =
new SqlConnection(connectionString);

// step 3: formulate a SELECT statement to retrieve the
// CustomerID, CompanyName, ContactName, and Address
// columns for the first ten rows from the Customers table
string selectString =
“SELECT CustomerID, CompanyName, ContactName, Address ” +
“FROM Customers ” +
“WHERE CustomerID < 'BSBEV'"; // step 4: create a SqlCommand object to hold the SELECT statement SqlCommand mySqlCommand = mySqlConnection.CreateCommand(); // step 5: set the CommandText property of the SqlCommand object to // the SELECT string mySqlCommand.CommandText = selectString; // step 6: create a SqlDataAdapter object SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter(); // step 7: set the SelectCommand property of the SqlAdapter object // to the SqlCommand object mySqlDataAdapter.SelectCommand = mySqlCommand; // step 8: create a DataSet object to store the results of // the SELECT statement DataSet myDataSet = new DataSet(); // step 9: open the database connection using the // Open() method of the SqlConnection object mySqlConnection.Open(); // step 10: use the Fill() method of the SqlDataAdapter object to // retrieve the rows from the table, storing the rows locally // in a DataTable of the DataSet object Console.WriteLine("Retrieving rows from the Customers table"); string dataTableName = "Customers"; mySqlDataAdapter.Fill(myDataSet, dataTableName); // step 11: get the DataTable object from the DataSet object DataTable myDataTable = myDataSet.Tables[dataTableName]; // step 12: display the columns for each row in the DataTable, // using a DataRow object to access each row in the DataTable foreach (DataRow myDataRow in myDataTable.Rows) { Console.WriteLine("CustomerID = " + myDataRow["CustomerID"]); Console.WriteLine("CompanyName = " + myDataRow["CompanyName"]); Console.WriteLine("ContactName = " + myDataRow["ContactName"]); Console.WriteLine("Address = " + myDataRow["Address"]); } // step 13: close the database connection using the Close() method // of the SqlConnection object created in Step 2 mySqlConnection.Close(); } } [/csharp]

   
 

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

class ExecuteScalar {
    public static void Main() {
        SqlConnection mySqlConnection = new SqlConnection("server=localhost;database=Northwind;uid=sa;pwd=sa");
        SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
        mySqlCommand.CommandText = "SELECT COUNT(*) FROM Products";
        mySqlConnection.Open();

        int returnValue = (int)mySqlCommand.ExecuteScalar();
        Console.WriteLine("mySqlCommand.ExecuteScalar() = " + returnValue);

        mySqlConnection.Close();
    }
}