How to replace some particular string in a list of type string using linq?

Question

Hi all I have list of type string with some items. i want to replace some items using linq, how can i do that? my below code is working fine but i want to do this in single line of code using the power of linq.

Here is my code :

List<string> listcolumns = columns.ToList();//Array to list

if (listcolumns.Contains("HowToReplace") && listcolumns.Contains("HowTo Replace"))
{
    int index = 0;
    index = listcolumns.IndexOf("HowToReplace");
    if (index > 0)
    {
        listcolumns.RemoveAt(index);
        listcolumns.Insert(index, "HowTo Replace");
    }
    index = listcolumns.IndexOf("HowToReplace");
    if (index > 0)
    {
        listcolumns.RemoveAt(index);
        listcolumns.Insert(index, "HowTo Replace");
    }
    columns = listcolumns.ToArray<string>();//List to array
}

Answer 1

With Linq:

listColumns.Select<string,string>(s => s == "HowToReplace" ? "HowTo Replace" : s).ToArray();

Without Linq:

 for (int i=0; i<listColumns.Length; i++) 
    if (ListColumns[i] == "HowToreplace") ListColumns[i] ="HowTo Replace");