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Control.RightToLeftChanged Event

Occurs when the RightToLeft property value changes.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

'Declaration
Public Event RightToLeftChanged As EventHandler

This event is raised if the RightToLeft property is changed by either a programmatic modification or user interaction.

For more information about handling events, see Handling and Raising Events.

The following code example is an event handler that is executed when the Text property value changes. The Control class has several methods with the name pattern PropertyName Changed that are raised when the corresponding PropertyName value changes (PropertyName represents the name of the corresponding property).

The following code example changes the ForeColor of a TextBox displaying currency data. The example converts the text to a decimal number and changes the ForeColor to Color.Red if the number is negative and to Color.Black if the number is positive. This example requires that you have a Form that contains a TextBox.

Private Sub currencyTextBox_TextChanged(sender As Object, _ 
  e As EventArgs) Handles currencyTextBox.TextChanged
   Try 
      ' Convert the text to a Double and determine if it is a negative number. 
      If Double.Parse(currencyTextBox.Text) < 0 Then 
         ' If the number is negative, display it in Red.
         currencyTextBox.ForeColor = Color.Red
      Else 
         ' If the number is not negative, display it in Black.
         currencyTextBox.ForeColor = Color.Black
      End If 
   Catch 
      ' If there is an error, display the text using the system colors.
      currencyTextBox.ForeColor = SystemColors.ControlText
   End Try 
End Sub

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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