How to Connect SQL Server In C#

This time, I will teach you how to connect SQL Server 2005 to C# using Microsoft Visual Studio 2008. With this, you can create a connection between C#.net and SQL Server 2005 database.

Let’s begin:

First, open Visual Studio and create a new project.

The window of “New Project” will appear. In the New Project window, select “Visual C#” and create a new Windows Form Application.

Do the form just like this.

Now, double click a button and do the following codes for the connection between SQL Server and Visual C#.

Note: Put using System.Data.SqlClient; above the namespace to access sql server library.

private void button1_Click(object sender, EventArgs e)
 {
 //initialize sql connection
 SqlConnection con = new SqlConnection();

//set a connection string
 con.ConnectionString = "Data Source=.\\SQLEXPRESS;Database=testdb;trusted_connection=true;";

//opening connection
 con.Open();

//validating connection
 if (con.State == ConnectionState.Open)
 {
 button1.Text = "Disconnect Me";
 label2.Text = "Connected";
 con.Close();

}
 else
 {
 button1.Text = "Connect Me";
 label2.Text = "Disconnected";
 }
 }

Output:

You can do this following example:

private void button1_Click(object sender, EventArgs e)
 {
 //initialize sql connection
 SqlConnection con = new SqlConnection();

//set a connection string
 con.ConnectionString = "Server=.\\SQLEXPRESS;" +
 "User Instance=true;" +
 "Integrated Security=true;" +
 "AttachDbFilename=" + Application.StartupPath + "\\testdb.mdf;";
 //original Path:
 //C:\Users\Janobe\Documents\Visual Studio 2008\Projects\SQLconnect\SQLconnect\bin\Debug

//opening connection
 con.Open();

//validating connection
 if (con.State == ConnectionState.Open)
 {
 button1.Text = "Disconnect Me";
 label2.Text = "Connected";
 con.Close();

}
 else
 {
 button1.Text = "Connect Me";
 label2.Text = "Disconnected";
 }
 }

Reminder: You must put your database file(testdb.mdf) inside the bin folder of your project to make this second example work.

Output:

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