(adsbygoogle = window.adsbygoogle || []).push({});1. You can use one of the reserved words of c# with the @ symbol Eg : string @int = "senthil kumar"; or something like this string @class ="MCA"; Although you can use this , avoid using one. 2. Before a string specially when using the file paths . You can use string filepath = @"D:\SENTHIL-DATA\myprofile.txt"; instead...