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RichTextBox.SelectionLength Property

Gets or sets the number of characters selected in control.

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

public override int SelectionLength { get; set; }

Property Value

Type: System.Int32
The number of characters selected in the text box.

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 SelectionLength 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 void ModifySelectedText()
   // Determine if text is selected in the control.
   if (richTextBox1.SelectionLength > 0)
      // 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 | FontStyle.Underline);
      // Protect the selected text from modification.
      richTextBox1.SelectionProtected = true;

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.