Gets or sets the color of text when the text is selected in a System.Windows.Forms.RichTextBox control.
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Use RichTextBox.SelectionBackColor to get or set the color of selected text in the System.Windows.Forms.RichTextBox. If no text is currently selected, the RichTextBox.SelectionBackColor property applies to the current position of the caret. Characters that are entered from that position have the specified RichTextBox.SelectionBackColor.