StringBuilder.Append vs string.Join

This is most common situation we encounter, joining an array (list) of string into a delimiter seperarted string (most commonly comma seperated). We use string builder to append the array items and make it as one string using a foreach loop.


string[] stringArray = new string[] { "This", "is", "single", "string" };
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Stringbuilder way

StringBuilder sbObject = new StringBuilder();


foreach (string strItem in stringArray)
        sbObject.Append(strItem + " ");
string finalString = sbObject.ToString();


//remove the last character
finalString = finalString.Substring(0, finalString.Length);

output for this code is
"This is single string"
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Instead of the above code we can use string.Join(), a built in method which is much efficient and reduces coding effort significantly.

string finalString = string.Join(" ", stringArray);
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happy coding