How to Connect to Database using C#

Ahmed S — Tue, 27 Aug 2013 08:00:00 +0000

Hi Friend this very simple program : How to Connect to Database using C#

using System;

usingSystem.Collections.Generic;

usingSystem.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

usingSystem.Windows.Forms;

usingSystem.Data.SqlClient; // SQL Server Connection

usingSystem.Data.OleDb; //Access Databse Connection

usingOracle.DataAccess.Client; //Oracle Databse Connection

//Oracle Connection add a reference of the assembly Oracle.DataAccess.dll.

namespaceHowToConnectSqlDatabase

{

publicpartial class Form1 : Form

{

publicForm1()

{

InitializeComponent();

}

//Access Database Connection

privatevoid AccessDatabase_Click(object sender, EventArgse)

{

OleDbConnectionOleCnn =new

OleDbConnection(“Provider=Microsoft.ACE.OLEDB.12.0;Data Source=”

+@”C:Northwind 2007.accdb”);

OleDbCommandOldcmd;

try

{

OleCnn.Open();

Oldcmd = new OleDbCommand(“SELECT * From Employees”,OleCnn);

Oldcmd.ExecuteNonQuery();

MessageBox.Show(“Success”);

OleCnn.Close();

}

catch(Exception ex)

{

MessageBox.Show(ex.Message);

}

//SQL Server Database Connection

private void SQLServer_Click(objectsender, EventArgs e)

{

SqlConnection cnn = new SqlConnection(“Data Source=ServerName;Initial

Catalog=Databasename;Integrated Security=True”);

SqlCommand cmd;

try

{

cnn.Open();

cmd = new SqlCommand(“SELECT * From Employees”,cnn);

cmd.ExecuteNonQuery();

MessageBox.Show(“Success”);

cnn.Close();

}

catch(Exception ex)

{

MessageBox.Show(ex.Message);

}

//Oracle Database Connection

private void Oracle_Click(objectsender, EventArgs e)

{

OracleConnection Oracnn = new OracleConnection(“User ID=hr;Password=hr;Data

Source=ServerName;”);

OracleCommand OraCmd;

try

{

Oracnn.Open();

OraCmd = new OracleCommand(“SELECT * From Employees”, Oracnn);

OraCmd.ExecuteNonQuery();

MessageBox.Show(“Success”);

Oracnn.Close();

}

catch(Exception ex)

{

MessageBox.Show(ex.Message);

}

// If you like this please share

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How to Connect to Database using C#