Convert a list to a string in C#

Maybe you are trying to do

string combindedString = string.Join( ",", myList.ToArray() );

You can replace "," with what you want to split the elements in the list by.

Edit: As mention in the comments you could also do

string combindedString = string.Join( ",", myList);

Reference:

Join<T>(String, IEnumerable<T>) 
Concatenates the members of a collection, using the specified separator between each member.

I am going to go with my gut feeling and assume you want to concatenate the result of calling ToString on each element of the list.

var result = string.Join(",", list.ToArray());

You could use string.Join:

List<string> list = new List<string>()
{
    "Red",
    "Blue",
    "Green"
};

string output = string.Join(Environment.NewLine, list.ToArray());    
Console.Write(output);

The result would be:

Red    
Blue    
Green

As an alternative to Environment.NewLine, you can replace it with a string based line-separator of your choosing.