StateChangeEventArgs Class
Provides data for the state change event of a .NET Framework data provider.
Assembly: System.Data (in System.Data.dll)
The data is used by the StateChange property of the OleDbConnection and the StateChange property of the SqlConnection.
The following example shows how to use the StateChange event within the SqlConnection class.
' Handler for the OnStateChange event. Private Sub OnStateChange(ByVal sender As Object, _ ByVal e As StateChangeEventArgs) PrintEventArgs(e) End Sub Sub Main() FillDataSet() End Sub Private Sub FillDataSet() Dim connectionString As String = GetConnectionString() Dim queryString As String = _ "SELECT ProductID, UnitPrice from dbo.Products;" ' Create a DataAdapter. Using dataAdapter As New SqlDataAdapter( _ queryString, connectionString) ' Add the handlers. AddHandler dataAdapter.SelectCommand.Connection.StateChange, _ AddressOf OnStateChange ' Create a DataSet. Dim dataSet As New DataSet() ' Fill the DataSet, which fires several StateChange events. dataAdapter.Fill(dataSet, 0, 5, "Table") End Using End Sub Private Sub PrintEventArgs(ByVal args As StateChangeEventArgs) Console.WriteLine("StateChangeEventArgs") Console.WriteLine(" OriginalState= {0} CurrentState= {1}", _ args.OriginalState, args.CurrentState) End Sub Private Function GetConnectionString() As String ' To avoid storing the connection string in your code, ' you can retrieve it from a configuration file. Return "Data Source=(local);Initial Catalog=Northwind;" _ & "Integrated Security=true;" End Function
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The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.