Gets or sets the number of characters selected in control.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
You can use this property to determine if any characters are currently selected in the text box control before performing operations on the selected text. You can also use this property to determine the total number of characters (including spaces) that are selected when performing single character tasks in a for loop.
The following code example demonstrates how to use the property to determine if text is selected within the RichTextBox. This example requires that a RichTextBox control, named richTextBox1, has been added to the form. The example also requires that richTextBox1 contains text that is selected in the control.
Private Sub ModifySelectedText() ' Determine if text is selected in the control. If (richTextBox1.SelectionLength > 0) Then ' Set the color of the selected text in the control. richTextBox1.SelectionColor = Color.Red ' Set the font of the selected text to bold and underlined. richTextBox1.SelectionFont = New Font("Arial", 10, FontStyle.Bold Or FontStyle.Underline) ' Protect the selected text from modification. richTextBox1.SelectionProtected = True End If End Sub