Make String concatenation faster in C# [duplicate]

Answer 1

System.Text.StringBuilder is the type you want to use for string concatenation operations in a loop. It is going to be far more efficient. Use .Append(value) on the object during each iteration.

StringBuilder builder = new StringBuilder();

// and inside your loop 
{
    if (blah)
        builder.Append("1");
    else
        builder.Append("0");
}

string output = builder.ToString(); // use the final result