prepend a string to the beginning of another string in csharp

To prepend a string (let's call it str1) to the beginning of another string (let's call it str2) in C#, you can use the concatenation operator (+) or the String.Concat method. Here are two examples:

Using the + operator:

main.cs
string str1 = "Hello, ";
string str2 = "world!";
string result = str1 + str2; // "Hello, world!"
97 chars
4 lines

Using the String.Concat method:

main.cs
string str1 = "Hello, ";
string str2 = "world!";
string result = String.Concat(str1, str2); // "Hello, world!"
111 chars
4 lines

Both of these options work, but keep in mind that the + operator creates a new string object every time it is used, so it can result in inefficient string manipulation. To avoid this, you can use the StringBuilder class for more complex scenarios that involve concatenating many strings.