User FAQs

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1) What is the difference between System.String and System.Text.StringBuilder ?
System.Text.StringBuilder is not an immutable data type and is therefore more efficient when a lot of string manipulations are required.
System.String is an immutable data type.

System.Text.StringBuilder myStringBuilder; 
myStringBuilder = new System.Text.StringBuilder("some text"); 
myStringBuilder.Append("more"); 
myStringBuilder.Replace("e","a"); 

2) Can you give an example of string interpolation ?
Use string interpolation to concatenate short strings, as shown in the following code.

string displayName = $"{nameList[n].LastName}, {nameList[n].FirstName}"; 

3) What is the fastest way to append strings in a loop ?
To append strings in loops, especially when you're working with large amounts of text, use a StringBuilder object.

var phrase = "la"; 
var manyPhrases = new StringBuilder(); 
for (var i = 0; i < 10000; i++) 
{ 
    manyPhrases.Append(phrase); 
} 

4) What does the @ prefix mean at the start of a text string ?
When you use a "@" prefix you do not have to escape any special characters.
For example you do not have to use a double slash \\ when you want to include a slash.
However you do have to use two double quotes to input a double quote.

string myString = "C:\\temp" 
string myString = @"C:\temp" 
string myString = @"You need a double quote "" for a double quote"