How do you connect your VB.NET application to SQL Server?

Given below is the sample code which shows how to establish connection between VB.NET application and SQL Server:




Public sub Form_Load()
Dim sampleConnection As New SqlConnection
Dim sampleCommand As New SqlCommand
Dim sampleReader As SqlDataReader
Try
sampleConnection.ConnectionString = AppSettings.Item(“SampleConnString”)
sampleConnection.Open()
sampleCommand = New SqlCommand(“Select rollNo from Students”)
sampleCommand.Connection = sampleConnection
sampleReader = sampleCommand.ExecuteReader()
Do While sampleReader.Read()
lstRollNo.Items.Add(sampleReader.Item(“rollNo”))
Loop
Catch sampleEx As Exception
Throw sampleEx
Finally
sampleConnection.Close()
End Try
<appSettings>
<add key=” SampleConnString” value=”Server=sampleSQLServer;UserID=scott; Database=Students”/>
</appSettings>
End Sub

In this example, you create a sampleConnection by defining its ConnectionString attribute. You then open the connection by calling Open() method of sampleConnection. Now you can use this connection in your command and finally you have to call close() of the connection.

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