these are not interpreted by compiler and they are kept
with the output-

verbatim string starts with an @ sign character
followed by the string in quotation marks -

string csharp = @"Hello\tWorld"; // produces "Hello\tWorld"
string csharpExample = @"c:\Csharp\sample.txt";
// produces c:\Csharp\sample.txt

always use verbatim string to defin connection
string or query string -

string query = @"INSERT INTO t_Student VALUES
('" + studentObj.FirstName + "','" + studentObj.MiddleName + "','"
+ studentObj.LastName + "','" + studentObj.Address + "','" +
studentObj.MobileNumber + "','" + studentObj.DateOfBirth + "')";