Open Method (SqlConnection)

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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(); }

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

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

Reference

SqlConnection Class
SqlConnection Members
Close Method

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