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

class Class1{
  static void Main(string[] args){
         SqlConnection thisConnection = new SqlConnection("server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI");
         SqlDataAdapter thisAdapter = new SqlDataAdapter("SELECT ID, FirstName FROM Employee", thisConnection);

         SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter);

         DataSet thisDataSet = new DataSet();

         thisAdapter.Fill(thisDataSet, "Employee");

         Console.WriteLine("name before change: {0}", thisDataSet.Tables["Employee"].Rows[9]["FirstName"]);

         thisDataSet.Tables["Employee"].Rows[1]["FirstName"] = "Inc";

         thisAdapter.Update(thisDataSet, "Employee");

         Console.WriteLine("name after change: {0}", thisDataSet.Tables["Employee"].Rows[9]["FirstName"]);


  }
}

           
          

   


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

   class PropagateDeletes {
      static void Main() {
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";

         string qry = @"select * from employee ";

         string del = @"delete from employee where id = @id";

         SqlConnection conn = new SqlConnection(connString);

         try {
            SqlDataAdapter da = new SqlDataAdapter();
            da.SelectCommand = new SqlCommand(qry, conn);

            DataSet ds = new DataSet();   
            da.Fill(ds, "employee");
            DataTable dt = ds.Tables["employee"];

            SqlCommand cmd = new SqlCommand(del, conn);
            cmd.Parameters.Add("@id",SqlDbType.Int, 4, "id");
            string filt = @"firstname = 'o' and lastname = 'B'";

            foreach (DataRow row in dt.Select(filt)) {
               row.Delete();
            }
            da.DeleteCommand = cmd;
            da.Update(ds, "employee");

            foreach (DataRow row in dt.Rows) {
               Console.WriteLine(
                  "{0} {1}",
                  row["firstname"].ToString().PadRight(15),
                  row["lastname"].ToString().PadLeft(25));
            }
         } catch(Exception e) {
            Console.WriteLine("Error: " + e);
         } finally {
            conn.Close();
         }
      }  
   }
           
          

   


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

class Class1{
      public static void Main() {
         SqlConnection thisConnection = new SqlConnection("server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI");

         SqlDataAdapter thisAdapter = new SqlDataAdapter( 
            "SELECT ID, FirstName FROM Employee", thisConnection);

         SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter);

         DataSet thisDataSet = new DataSet();

         thisAdapter.Fill(thisDataSet, "Employee");

         Console.WriteLine("# rows before change: {0}",thisDataSet.Tables["Employee"].Rows.Count);

         DataRow thisRow = thisDataSet.Tables["Employee"].NewRow();
         thisRow["ID"] = "123";
         thisRow["FirstName"] = "Ltd";
         thisDataSet.Tables["Employee"].Rows.Add(thisRow);

         Console.WriteLine("# rows after change: {0}", thisDataSet.Tables["Employee"].Rows.Count);

         thisAdapter.Update(thisDataSet, "Employee");
      }
}


           
          

using System;
using System.Collections.Generic;
using System.Text;

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

class Program {
static void Main(string[] args) {
SqlConnectionStringBuilder cnStrBuilder = new SqlConnectionStringBuilder();
cnStrBuilder.UserID = “sa”;
cnStrBuilder.Password = “”;
cnStrBuilder.InitialCatalog = “Cars”;
cnStrBuilder.DataSource = “(local)”;
cnStrBuilder.ConnectTimeout = 5;

SqlConnection cn = new SqlConnection();
cn.ConnectionString = cnStrBuilder.ConnectionString;
cn.Open();
ShowConnectionStatus(cn);

string strSQL = “SELECT * FROM Inventory”;
SqlCommand myCommand = new SqlCommand(strSQL, cn);

SqlDataReader myDataReader;
myDataReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection);

while (myDataReader.Read()) {
for (int i = 0; i < myDataReader.FieldCount; i++) { Console.Write("{0} = {1} ",myDataReader.GetName(i),myDataReader.GetValue(i).ToString().Trim()); } } myDataReader.Close(); ShowConnectionStatus(cn); } private static void ShowConnectionStatus(DbConnection cn) { Console.WriteLine("Database location: {0}", cn.DataSource); Console.WriteLine("Database name: {0}", cn.Database); Console.WriteLine("Timeout: {0}", cn.ConnectionTimeout); Console.WriteLine("Connection state: {0} ", cn.State.ToString()); } } [/csharp]

   


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

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

         SqlCommand thisCommand = new SqlCommand();
         Console.WriteLine("Command created.");

         try {
            thisConnection.Open();

            thisCommand.Connection = thisConnection;
 
            thisCommand.CommandText = "SELECT COUNT(*) FROM Employee";
            Console.WriteLine("Ready to execute SQL command: {0}", thisCommand.CommandText);
         } catch (SqlException ex) {
            Console.WriteLine(ex.ToString());
         } finally {
            thisConnection.Close();
            Console.WriteLine("Connection Closed.");
         }
      }
   }


           
          

   


/*
 * 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.SqlClient;

namespace Client.Chapter_13___ADO.NET
{
    public class CreatingSQLConnections
    {
        static void Main(string[] args)
        {
            SqlConnection MyConnection = new SqlConnection("Data Source=(local); Initial  Catalog = MyDatabase; User ID=sa;Password=");

            MyConnection.Open();
        }
    }
}



           
          

   



// connect to Access database

/*
 * 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.OleDb;

namespace Client.Chapter_13___ADO.NET
{
    public class ConnectingToAccess
    {
        static void Main(string[] args)
        {
            OleDbConnection MyConnection = new OleDbConnection (
            @"Provider=Microsft.Jet.OLEDB.4.0; Data Source = c:MyAccessDB.mdb");
            MyConnection.Open();            
        }
    }
}