How to use double coute in string + C#

This usage of double coutes in a string can be easily done using @.
For eg:
To show the below text 
 "This is a "Test"


Code:
TextBox1.text = @"""This is a " + @"""Test""";


The logic is that if you use @ in front of the sting variable then using e double coute(""") 
throughout the string will give you one double coute(").