Try this :

Code:
string test = "its something unpredictable" + Environment.NewLine +
                     "but in the end is right." + Environment.NewLine +
                     "I hope you had the time of your life.";
And for the puritans out there :

Code:
StringBuilder testStringBuilder = new StringBuilder();
testStringBuilder.AppendLine("its something unpredictable");
testStringBuilder.AppendLine("but in the end is right.");
testStringBuilder.AppendLine("I hope you had the time of your life");
string test = testStringBuilder.ToString();
Darwen.