how to add two strings in c#.net

As the others have said, the '+' operator is used for simple string concatenation and as Sunasara has demonstrated the '@' string literal enables you to use a more freeform style in your strings.

You may have encountered problems with the '\' character in your own attempts to solve this. Sunasara'a solution will work (apart from the fact that he shows a slash rather than a backslash), or you could use

string c = a + "\\" + b;

Note the doubled backslash. The first is called an escape character and enables you to use characters in your strings that would otherwise be interpreted as keywords or control characters, such as the quote mark itself. Have a search for c# escape character for more information.

Tries following code.

String one = "One";
String two = "Two";
String both = one + "\\" + two;      //one for display and one for hiding meaning

When you want to add special characters in string its treated as special character so to hide the meaning of such special character by \
so,
writing n doesn't mean that its new line so we first hide the mean of n by \n that means new line character

String one = "One";
String two = "Two";
String both = one + "\" + two;

NB. This is fine for one or two concatinations, but if you need to do many/lots then use a StringBuilder.

Edit : Corrected the slash.

use following:

string a = "1";
string b = "2";
string c = a + @"/" + b;

Thanks,
Imdadhusen

string one = "One";
string two = "Two";
string delim = @"\";
string result = string.Join(delim, new string[] { one, two });