C-Sharp function to escape single-quote on XPath expression

In c-sharp, while using XPath expression to select nodes from XML Document like

string busname="Domino's Pizza";
xoEle = (XmlElement)xoDoc.DocumentElement.SelectSingleNode("//Review[RestaurantName='"
 + busname + "']");

would result in error such as

System.Xml.XPath.XPathException: '//Review[RestaurantName='Domino's Pizza']' has an invalid token.

This is due to single quote (Apostrophe) on variable used on XPath expressions.

Above problem (i.e) to escape single quote (Apostrophe) can be resolved by using XPATH concat function as

//Review[RestaurantName=concat("Domino","'","s Pizza")]

Hence below "ParseXpathString" function can be used to parse single quote on XPATH in C# .Net.

"ParseXpathString" function would create concat function programmatically.

private static string ParseXpathString(string input)
{
	string ret = "";
	if (input.Contains("'"))
	{
	    string[] inputstrs = input.Split('\'');
	    foreach (string inputstr in inputstrs)
	    {
		if (ret != "")
		    ret += ",\"'\",";
		ret += "\"" + inputstr + "\"";
	    }
	    ret = "concat(" + ret + ")";
	}
	else
	{
	    ret = "'" + input + "'";
	}
	return ret;
}

This function as be used as

xoEle = (XmlElement)xoDoc.DocumentElement.SelectSingleNode("//Review[RestaurantName="
 + ParseXpathString(busname) + "]");