Database ADO.net

Navigate the binded data using BindingManagerBase

Posted on by coder 
   

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

    public class Form1 : System.Windows.Forms.Form {
      private System.Windows.Forms.TextBox textBox1;
      private System.Windows.Forms.TextBox textBox2;
      private System.Windows.Forms.Button buttonBack;
      private System.Windows.Forms.Button buttonNext;
      private System.Data.DataSet dataSet1;
      private System.ComponentModel.Container components = null;

      private BindingManagerBase bMgr;

      public Form1() {
        InitializeComponent();
      }

      private void InitializeComponent() {
         this.textBox1 = new System.Windows.Forms.TextBox();
         this.textBox2 = new System.Windows.Forms.TextBox();
         this.buttonBack = new System.Windows.Forms.Button();
         this.buttonNext = new System.Windows.Forms.Button();
         this.dataSet1 = new System.Data.DataSet();
         ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).BeginInit();
         this.SuspendLayout();

         this.textBox1.Location = new System.Drawing.Point(8, 8);
         this.textBox1.Name = "textBox1";
         this.textBox1.Size = new System.Drawing.Size(160, 20);
         this.textBox1.TabIndex = 0;
         this.textBox1.Text = "textBox1";

         this.textBox2.Location = new System.Drawing.Point(8, 40);
         this.textBox2.Name = "textBox2";
         this.textBox2.Size = new System.Drawing.Size(160, 20);
         this.textBox2.TabIndex = 1;
         this.textBox2.Text = "textBox2";

         this.buttonBack.Location = new System.Drawing.Point(24, 80);
         this.buttonBack.Name = "buttonBack";
         this.buttonBack.Size = new System.Drawing.Size(56, 23);
         this.buttonBack.TabIndex = 2;
         this.buttonBack.Text = "<< Back";
         this.buttonBack.Click += new System.EventHandler(this.buttonBack_Click);

         this.buttonNext.Location = new System.Drawing.Point(96, 80);
         this.buttonNext.Name = "buttonNext";
         this.buttonNext.Size = new System.Drawing.Size(56, 23);
         this.buttonNext.TabIndex = 3;
         this.buttonNext.Text = "Next>>";
         this.buttonNext.Click += new System.EventHandler(this.buttonNext_Click);

         this.dataSet1.DataSetName = "NewDataSet";
         this.dataSet1.Locale = new System.Globalization.CultureInfo("en-US");

         this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
         this.ClientSize = new System.Drawing.Size(176, 108);
         this.Controls.Add(this.buttonNext);
         this.Controls.Add(this.buttonBack);
         this.Controls.Add(this.textBox2);
         this.Controls.Add(this.textBox1);
         this.Name = "Form1";
         this.Text = "Form1";
         this.Load += new System.EventHandler(this.Form1_Load);
         ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).EndInit();
         this.ResumeLayout(false);
      }

      static void Main() {
         Application.Run(new Form1());
      }

      private void Form1_Load(object sender, System.EventArgs e) {
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
         string sql = @"select * from employee ";

         SqlConnection conn = new SqlConnection(connString);
         SqlDataAdapter da = new SqlDataAdapter(sql, conn);
         da.Fill(dataSet1, "employee");

         textBox1.DataBindings.Add("text", dataSet1, "employee.firstname");
         textBox2.DataBindings.Add("text", dataSet1, "employee.lastname");
  
         bMgr = this.BindingContext[dataSet1, "employee"];
      }

      private void buttonNext_Click(object sender, System.EventArgs e) {
         bMgr.Position += 1;    
      }

      private void buttonBack_Click(object sender, System.EventArgs e) {
         bMgr.Position -= 1;
      }
    }

Using ADO.NET Events

Posted on by coder 
   


/*
 * 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 UsingADONETEvents
    {
        static void Main(string[] args)
        {
            SqlConnection MyConnection = new SqlConnection(@"Data Source=(local); Initial Catalog = CaseManager; Integrated Security=true");

            MyConnection.StateChange += new StateChangeEventHandler(OnStateChange);
            MyConnection.Open(); //Trigger Open Event
            MyConnection.Close();
        }
        public static void OnStateChange(object sender, System.Data.StateChangeEventArgs e)
        {
            Console.WriteLine("Connection State Chnaged: {0}", ((SqlConnection)sender).State);
        }
    }
}

Connect to an Access database file

Posted on by coder 
   

using System;
using System.Data;
using System.Data.OleDb;

class AccessConnect {
   static void Main() 
   {
      string connString = @"provider = microsoft.jet.oledb.4.0;data source = Employee.mdb;";

      OleDbConnection conn = new OleDbConnection(connString);

      try 
      {
         conn.Open();
         Console.WriteLine("Connection opened.");

         Console.WriteLine("Connection Properties:");   
         Console.WriteLine("	Connection String: {0}", conn.ConnectionString);    
         Console.WriteLine("	Database: {0}",conn.Database);   
         Console.WriteLine("	DataSource: {0}",conn.DataSource);
         Console.WriteLine("	ServerVersion: {0}", conn.ServerVersion);
         Console.WriteLine("	State: {0}", conn.State);
      } catch (OleDbException e) {
         Console.WriteLine("Error: " + e);  
      } finally  {
         conn.Close();
         Console.WriteLine("Connection closed.");
      }
   }
}

Read query result data from Access database

Posted on by coder 
   

using System;
using System.Data;
using System.Data.OleDb;

   class CommandOleDbQuery
   {
      static void Main() 
      {
         OleDbConnection thisConnection = new OleDbConnection("provider = microsoft.jet.oledb.4.0;data source = Employee.mdb;");
      
         OleDbCommand thisCommand = new OleDbCommand("SELECT ID, FirstName FROM Employee",thisConnection);

         try 
         {
            thisConnection.Open();
            OleDbDataReader thisReader = thisCommand.ExecuteReader();

            while (thisReader.Read()) {
               Console.WriteLine("Product ID and Name: {0} {1}",
                  thisReader.GetValue(0),
                  thisReader.GetValue(1));
            }
         } 
         catch (OleDbException ex) 
         {
            Console.WriteLine(ex.ToString());
         }
         finally 
         {  
            thisConnection.Close();
            Console.WriteLine("Connection Closed.");
         }
      }
   }

Use OdbcCommand to read data in Access database and fill the DataGrid

Posted on by coder 
   
 

using System;
using System.Diagnostics;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.Odbc;


public class Form1 : System.Windows.Forms.Form {
    private System.Windows.Forms.Button button1;
    private System.Windows.Forms.DataGrid dataGrid1;
    private System.Windows.Forms.Button button2;
    public Form1() {
        this.button1 = new System.Windows.Forms.Button();
        this.dataGrid1 = new System.Windows.Forms.DataGrid();
        this.button2 = new System.Windows.Forms.Button();
        ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
        this.SuspendLayout();

        this.button1.Location = new System.Drawing.Point(8, 240);
        this.button1.Size = new System.Drawing.Size(104, 32);
        this.button1.Text = "Get Data From Biblio";
        this.button1.Click += new System.EventHandler(this.button1_Click);

        this.dataGrid1.DataMember = "";
        this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
        this.dataGrid1.Location = new System.Drawing.Point(8, 8);
        this.dataGrid1.Size = new System.Drawing.Size(280, 224);

        this.button2.Location = new System.Drawing.Point(120, 240);
        this.button2.Size = new System.Drawing.Size(152, 32);
        this.button2.Text = "Get Data From Access Northwind";
        this.button2.Click += new System.EventHandler(this.button2_Click);

        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(292, 273);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.button2,
                                                                          this.dataGrid1,
                                                                          this.button1});
        ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
        this.ResumeLayout(false);

    }
    [STAThread]
    static void Main() {
        Application.Run(new Form1());
    }

    private OdbcConnection cn;

    private void button1_Click(object sender, System.EventArgs e) {
        try {
            cn = new OdbcConnection("DRIVER={SQL Server};SERVER=.;uid=admin;pwd=pw;database=biblio");
            cn.Open();
            OdbcCommand sc = new OdbcCommand("SELECT title, price FROM titles WHERE title LIKE &#039;Hi%&#039;", cn);
            OdbcDataAdapter da = new OdbcDataAdapter(sc);
            DataSet ds = new DataSet("TitlesDS");
            da.Fill(ds);
            dataGrid1.DataSource = ds.Tables[0];
        } catch (Exception ex) {
            Debug.WriteLine(ex.ToString());
        } finally {
            cn.Close();
        }
    }

    private void button2_Click(object sender, System.EventArgs e) {
        try {
            cn = new OdbcConnection(@"DRIVER={Microsoft Access Driver (*.mdb)};DBQ=c:NorthWind.mdb");
            cn.Open();
            OdbcCommand sc = new OdbcCommand("SELECT * from Employees", cn);
            OdbcDataAdapter da = new OdbcDataAdapter(sc);
            DataSet ds = new DataSet("TitlesDS");
            da.Fill(ds);
            dataGrid1.DataSource = ds.Tables[0];
        } catch (Exception ex) {
            MessageBox.Show("You probably need to change the file path to NorthWind.MDB used in the OdbcConnection Constructor
 or move a copy of the NorthWind.mdb to c:");
            Debug.WriteLine(ex.ToString());
        } finally {
            cn.Close();
        }
    }
}

How to use an OleDbConnection object to connect to an Access database

Posted on by coder 
   

using System;
using System.Data;
using System.Data.OleDb;

class OleDbConnectionAccess {
  public static void Main() {
    string connectionString = "provider=Microsoft.Jet.OLEDB.4.0;data source=.Northwind.mdb";

    OleDbConnection myOleDbConnection = new OleDbConnection(connectionString);

    OleDbCommand myOleDbCommand = myOleDbConnection.CreateCommand();

    myOleDbCommand.CommandText =
      "SELECT CustomerID, CompanyName, ContactName, Address "+
      "FROM Customers "+
      "WHERE CustomerID = &#039;ALFKI&#039;";
    myOleDbConnection.Open();

    OleDbDataReader myOleDbDataReader = myOleDbCommand.ExecuteReader();

    myOleDbDataReader.Read();

    Console.WriteLine("myOleDbDataReader[" CustomerID"] = "+ myOleDbDataReader["CustomerID"]);
    Console.WriteLine("myOleDbDataReader[" CompanyName"] = "+ myOleDbDataReader["CompanyName"]);
    Console.WriteLine("myOleDbDataReader[" ContactName"] = "+ myOleDbDataReader["ContactName"]);
    Console.WriteLine("myOleDbDataReader[" Address"] = "+ myOleDbDataReader["Address"]);

    myOleDbDataReader.Close();

    myOleDbConnection.Close();
  }
}

Reading Access Data

Posted on by coder 
   
 
using System;
using System.Data;           
using System.Data.OleDb;     
using System.Collections.Generic;
using System.Text;

class Program {
    static void Main(string[] args) {
        OleDbConnection thisConnection = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:
wind.mdb");
        thisConnection.Open();
        OleDbCommand thisCommand = thisConnection.CreateCommand();
        thisCommand.CommandText = "SELECT CustomerID, CompanyName FROM Customers";
        OleDbDataReader thisReader = thisCommand.ExecuteReader();
        while (thisReader.Read()) {
            Console.WriteLine("	{0}	{1}",thisReader["CustomerID"], thisReader["CompanyName"]);
        }
        thisReader.Close();
        thisConnection.Close();
    }
}