Access database at runtime using ADO.NET

Steps to connect to database

Declare and initialize database connection object with appropriate connection string.
Create a DataAdapter and a Dataset object.
Using fill method of the DataAdapter object, load the data into the Dataset Object.
Display the data using data binding feature of controls like Datagrid or Datalist.

Code to connect to database using VB.NET

Dim m_adptEmp As SqlDataAdapter

Private Sub Page_Load(ByVal sender As System.Object, _
   ByValeAsSystem.EventArgs)HandlesMyBase.Load
   DimEmpConnAsNewSqlConnection_
   ("server=(local);database=Employees;Trusted_Connection=yes")
     m_adptEmp = New SqlDataAdapter("select * from Emp", EmpConn)
     Dim dsEmp As New DataSet
     m_adptEmp.Fill(dsEmp, "Emp")
     DataGrid1.DataSource = dsEmp.Tables("Emp").DefaultView
     DataGrid1.DataBind()
End Sub