Encode Xml Special Character (<,>,',",&) in javaScript and C#

These special character (<,>,',",&) will be encode first when making xml because on these special character the xml will broke.
The below function is used when string containing the above special character,

function specialXmlCharacterEncode(str) {

    return String(str)

            .replace(/&/g, '&')

            .replace(/"/g, '"')

            .replace(/'/g, ''')

            .replace(/</g, '&lt;')

            .replace(/>/g, '&gt;');

}

In C# this line of code is used when string containing  special character and you make xml query and use string in xml query like in fetchXml query.

 string  str =  SecurityElement.Escape(str);