foreach (Paragraph p in radRichTextBox1.Document.EnumerateChildrenOfType<Paragraph>()) { p.LineSpacing = 0; } Comment: This is not an issue. RadRichTextBox behaves the same way as MS Word. You should set the SpacingAfter property to 0 in this case. The LineSpacing property determines the row height and the SpacingAfter one determines the spacing after the current paragraph. (e.g. when the user presses the Enter key)