C#QuotedStr方法实现,引号的处理

在Delphi中处理引号有QuotedStr函数，但C#中却没有相应的处理！所以转换了Delphi的代码为C#中来处理。。以下为代码！

        protected string QuotedStr(string S)        {            string vResult;            vResult = S;            for (int i = vResult.Length-1; i >= 0; i--)            {                if (vResult[i].Equals('\''))                {                    vResult=vResult.Insert(i, "\'");                }            }            vResult = "'" + vResult + "'";            return vResult;        }        private void button1_Click(object sender, EventArgs e)        {            string vString,vTemp,vCondition;            vString = "ab'cd";            vCondition = string.Format("ProjectName= {0}", QuotedStr(vString));            MessageBox.Show(vCondition);        }