If your problem is clearing the console then use the method Console.Clear();, if it s not, use this to overwrite the last line;

Console.WriteLine("Searching file in...");
        foreach(var dir in DirList)
         {
           Console.SetCursorPosition(1,0);
           Console.WriteLine(dir);
         }

Use Console.SetCursorPosition to set the cursor on the start of the last line and rewrite it.

Something like:

Console.WriteLine(dir);
Console.SetCursorPosition(0, Console.CursorTop - 1);

EDIT:

According to your comment, you could do as follows:

Console.WriteLine("Searching file in...");
foreach (var dir in DirList)
{
    ClearCurrentConsoleLine();
    Console.Write(dir);
}

With ClearCurrentConsoleLine defined as:

public static void ClearCurrentConsoleLine()
{
    int currentLineCursor = Console.CursorTop;
    Console.SetCursorPosition(0, Console.CursorTop);
    for (int i = 0; i < Console.WindowWidth; i++)
        Console.Write(" ");
    Console.SetCursorPosition(0, currentLineCursor);
}

You could print using " ", that way cursor dont jump a line, and you can rewrite it.

foreach(var dir in DirList)
     {
       Console.Write("
{0}%           ",dir);
     }

use spaces after number to make sure everything is erased, and use .Write instead of WriteLine because you dont want to add " "

Just keep track of the current position of the cursor by saving the values of the Console.CursorLeft and Console.CursorTop properties. Then write, reset and repeat. Or rather in this case, reset, write and repeat.

Console.WriteLine("Searching file in...");

// save the current cursor position
var cursorLeft = Console.CursorLeft;
var cursorTop = Console.CursorTop;

// build a format string to establish the maximum width do display
var maxWidth = 60;
var fmt = String.Format("{{0,-{0}}}", maxWidth);

foreach (var dir in dirList)
{
    // restore the cursor position
    Console.SetCursorPosition(cursorLeft, cursorTop);

    // trim the name if necessary
    var name = Path.GetFileName(dir);
    if (name.Length > maxWidth)
        name = name.Substring(0, maxWidth);

    // write the trimmed name
    Console.Write(fmt, name);

    // do some work
}
Console.WriteLine(); // end the previous line

Although this is a quite old post, I will post my approach. Maybe this would help someone

Console.SetCursorPosition(0, Console.CursorTop);
Console.Write(new String(   , Console.WindowWidth));
Console.SetCursorPosition(0, Console.CursorTop);
Console.Write(dir);

I think this is what you want ;)

Console.WriteLine("Searching file in...");
    foreach(var dir in DirList)
     {
       Console.Write("r" + dir);
     }

This will do what I think you re asking for:

string s = "
";
s += new string(   , Console.CursorLeft);
s += "
";
Console.Write(s);

Essentially the same as @digEmAll suggested, but it uses the actual # of chars instead of Console.WindowWidth