Storing the Connection String in the Web Configuration File in Visual Studio .NET

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Storing the Connection String in the Web Configuration File
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<connectionStrings> <clear /> <add name="PubsData" providerName="System.Data.SqlClient" connectionString= "Data Source=.\SQLEXPRESS;
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Lesson 2: Using the ADO.NET Connected Classes
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AttachDbFilename=|DataDirectory|PUBS.MDF;
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Integrated Security=True;
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User Instance=True"/>
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</connectionStrings>
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This example clears the list of connectionStrings that may have been defined in the machine configuration file, and then adds a new connection string setting called PubsData. The connectionStrings can be accessed in code by using the static ConnectionStrings collection on the ConfigurationManager class. In the following code sample, a Label control is dynamically created, the PubsData connection string is read from the Web.config file, and connection information is displayed in the Label:
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'VB Protected Sub Button1_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Button1.Click
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Dim lbl As Label = GetLabel(275, 20)
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'Get the settings from the configuration file
Dim pubs As ConnectionStringSettings
pubs = ConfigurationManager.ConnectionStrings("PubsData")
'name = "PubsData"
lbl.Text = "<p><b>Name:</b> " _
+ pubs.Name + "</p>"
'provider = "System.Data.SqlClient"
lbl.Text += "<p><b>Provider Name:</b> " _
+ pubs.ProviderName + "</p>"
'cnString = "Data Source=.\SQLEXPRESS;
' AttachDbFilename=|DataDirectory|PUBS.MDF;
' Integrated Security=True;
' User Instance=True"
lbl.Text += "<p><b>Connection String:</b> " _
+ pubs.ConnectionString + "</p>" End Sub Private Function GetLabel(ByVal left As Integer, _ ByVal top As Integer) As Label
Dim lbl As New Label()
lbl.Style.Add("position", "absolute")
lbl.Style.Add("left", left.ToString() + "px")
lbl.Style.Add("top", top.ToString() + "px")
lbl.EnableViewState = False
form1.Controls.Add(lbl)
Return lbl
End Function //C# protected void Button1_Click(object sender, EventArgs e) { Label lbl = GetLabel(275, 20); //Get the settings from the configuration file
4
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ConnectionStringSettings pubs = ConfigurationManager.ConnectionStrings["PubsData"]; DbConnection connection = new SqlConnection(pubs.ConnectionString); //name = "PubsData" lbl.Text = "<p><b>Name:</b> " + pubs.Name + "</p>";
//provider = "System.Data.SqlClient"
lbl.Text += "<p><b>Provider Name:</b> "
+ pubs.ProviderName + "</p>";
//cnString = "Data Source=.\SQLEXPRESS;
// AttachDbFilename=|DataDirectory|PUBS.MDF;
// Integrated Security=True;
// User Instance=True"
lbl.Text += "<p><b>Connection String:</b> "
+ pubs.ConnectionString + "</p>";
private Label GetLabel(int left, int top) {
Label lbl = new Label();
lbl.Style.Add("position", "absolute");
lbl.Style.Add("left", left.ToString() + "px");
lbl.Style.Add("top", top.ToString() + "px");
lbl.EnableViewState = false;
form1.Controls.Add(lbl);
return lbl;
Working with Connection Pools
Creating and opening a connection to a data store can be a time-consuming and resource-intensive proposition, especially on Webbased systems, if you require separate connections to the data store on a user-by-user basis. It s easy to get into a situation where every user has one or more open connec tions to the database and the database server is consuming too many resources just managing connections. Ideally, the data store should be spending most of its time delivering data and as little time as possible maintaining connections. This is where connection pooling can help.
Connection pooling is the process of reusing existing active connections instead of cre ating new connections when a request is made to the database. It involves the use of a connection manager that is responsible for maintaining a list, or pool, of available connections. When the connection manager receives a request for a new connection, it checks its pool for available connections. If a connection is available, it is returned. If no connections are available, and the maximum pool size has not been reached, a new connection is created and returned. If the maximum pool size has been reached, the connection request is added to the queue and the next available connection is returned, as long as the connection timeout has not been reached.
Lesson 2: Using the ADO.NET Connected Classes
Connection pooling is controlled by parameters placed into the connection string. The following is a list of parameters that affect pooling:
Connection Timeout
The time in seconds to wait while a connection to the data store is attempted. The default is 15 seconds.
Min Pool Size
The minimum amount of pooled connections to keep in the pool. The default is 0. It s usually good to set this to a low number, such as 5, when your application requires consistent, fast response even if the application is inactive for long periods of time. The maximum allowed number of connections in the connection pool. The default is 100, which is usually more than enough for most Web site applications. A setting in which a value of true causes the request for a new connec tion to be drawn from the pool. If the pool does not exist, it is created. The default is true. An indicator that the database connection is reset when the connection is removed from the pool. The default is true. A value of false results in fewer round-trips to the server when creating a connection, but the connec tion state is not updated.
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