Open Method (SqlConnection)

In This Topic

Opens a SQL Server connection with the property settings specified by the ConnectionString.

Syntax

Visual Basic
C#

'Declaration
 
Public Overrides Sub Open()

public override void Open()

Remarks

The SqlConnection draws an open connection from the connection pool if one is available. Otherwise, it establishes a new connection to the data source.

Note: If the SqlConnection goes out of scope, the connection it represents does not close automatically. Therefore, you must explicitly close the connection by calling Close.

Opening an open connection does nothing.

Example

The following example creates a SqlConnection, opens it, displays some of its properties, and then closes the connection.

csharp

public void CreateSqlConnection(string myConnString)
{
  SqlConnection myConnection = new SqlConnection(myConnString);
  myConnection.Open();
  MessageBox.Show("ServerVersion: " + myConnection.ServerVersion
    + "\nState: " + myConnection.State.ToString());
  myConnection.Close();
}

Visual Basic

Public Sub CreateSqlConnection(myConnString As String)
  Dim myConnection As New SqlConnection(myConnString)
  myConnection.Open()
  MessageBox.Show("ServerVersion: " + myConnection.ServerVersion _
    + ControlChars.Cr + "State: " + myConnection.State.ToString())
  myConnection.Close()
End Sub

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

SqlConnection Class
SqlConnection Members
Close Method

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