Remove preview button in Umbraco

RemovePreviewButton.cs

public class RemovePreviewButton : ApplicationBase
{
	public RemovePreviewButton()
	{
		umbracoPage.Load += this.umbracoPage_Load;
	}

	private void umbracoPage_Load(object sender, EventArgs e)
	{
		var umbracoPage = (umbracoPage)sender;
		var path = umbracoPage.Page.Request.Path.ToLower().Replace(
			(umbraco.GlobalSettings.Path + "/").ToLower(), string.Empty);

		if (path != "editcontent.aspx")
		{
			return;
		}

		var script = @"<script type=""text/javascript"">
				$(document).ready(function () {
					$('img[title=Preview]').siblings('img.editorIconSplit:first').remove();
					$('img[title=Preview]').remove();
				});
				</script>";

		umbracoPage.Page.ClientScript.RegisterClientScriptBlock(
			umbracoPage.GetType(), "RemovePreviewButton", script, false);
	}
}