Control.OnLeave Method
Raises the Leave event.
Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.
The OnLeave method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.
Notes to InheritorsWhen overriding OnLeave in a derived class, be sure to call the base class's OnLeave method so that registered delegates receive the event.
The following code example uses the Leave event to reset a control to its former state.
private void textBox1_Enter(object sender, System.EventArgs e) { // If the TextBox contains text, change its foreground and background colors. if (textBox1.Text != String.Empty) { textBox1.ForeColor = Color.Red; textBox1.BackColor = Color.Black; // Move the selection pointer to the end of the text of the control. textBox1.Select(textBox1.Text.Length, 0); } } private void textBox1_Leave(object sender, System.EventArgs e) { // Reset the colors and selection of the TextBox after focus is lost. textBox1.ForeColor = Color.Black; textBox1.BackColor = Color.White; textBox1.Select(0,0); }
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
