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StateChangeEventArgs Class

Provides data for the state change event of a .NET Framework data provider.

Namespace:  System.Data
Assembly:  System.Data (in System.Data.dll)

'Declaration
Public NotInheritable Class StateChangeEventArgs _
	Inherits EventArgs
'Usage
Dim instance As StateChangeEventArgs

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

System.Object
  System.EventArgs
    System.Data.StateChangeEventArgs

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0
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