MVC Filtering A-Z - asp.net

Question

I have made the MVC Music Store from the tutorials and am editing it and adding new features, recently I made the browse store page have links from A-Z with an All button at the end.
How can I bring up a message that says "There are no artists beginning with the letter A, B, C " or whatever letter has been clicked with no artists.
Here is my code from my Store Index:
#model IEnumerable<MVCMusicStore.Models.Artist>
#{
ViewBag.Title = "Store";
}
<h3>Browse Artists</h3>
#Html.ActionLink("A", "Index", new { letter = "A" })
#Html.ActionLink("B", "Index", new { letter = "B" })
#Html.ActionLink("C", "Index", new { letter = "C" })
#Html.ActionLink("D", "Index", new { letter = "D" })
#Html.ActionLink("E", "Index", new { letter = "E" })
#Html.ActionLink("F", "Index", new { letter = "F" })
#Html.ActionLink("G", "Index", new { letter = "G" })
#Html.ActionLink("H", "Index", new { letter = "H" })
#Html.ActionLink("I", "Index", new { letter = "I" })
#Html.ActionLink("J", "Index", new { letter = "J" })
#Html.ActionLink("K", "Index", new { letter = "K" })
#Html.ActionLink("L", "Index", new { letter = "L" })
#Html.ActionLink("M", "Index", new { letter = "M" })
#Html.ActionLink("N", "Index", new { letter = "N" })
#Html.ActionLink("O", "Index", new { letter = "O" })
#Html.ActionLink("P", "Index", new { letter = "P" })
#Html.ActionLink("Q", "Index", new { letter = "Q" })
#Html.ActionLink("R", "Index", new { letter = "R" })
#Html.ActionLink("S", "Index", new { letter = "S" })
#Html.ActionLink("T", "Index", new { letter = "T" })
#Html.ActionLink("U", "Index", new { letter = "U" })
#Html.ActionLink("V", "Index", new { letter = "V" })
#Html.ActionLink("W", "Index", new { letter = "W" })
#Html.ActionLink("X", "Index", new { letter = "X" })
#Html.ActionLink("Y", "Index", new { letter = "Y" })
#Html.ActionLink("Z", "Index", new { letter = "Z" })
#Html.ActionLink("All", "Index", new { letter = "all" })
<ul>
#foreach (var artist in Model)
{
<li>#Html.ActionLink(artist.Name,
"Browse", new { id = artist.ArtistId })</li>
}
</ul>
This is the code from my Controller:
public ActionResult Index(string letter = "")
{
IEnumerable<Artist> artist;
if (letter == "all")
{
artist = storeDB.Artists.OrderBy(x =>x.Name).ToList();
}
else if (letter != "")
{
artist = storeDB.Artists.Where(a => a.Name.StartsWith(letter)).OrderBy(x => x.Name).ToList();
}
else
{
artist = new List<Artist>();
}

Answer 1

To make your view neater you could use:
#for (int y = 0; y < 27; y++) {
char filter = Convert.ToChar(65 + y);
string letter = filter.toString();
if(y == 27){
letter = "All";
}
#Html.ActionLink(letter, "Index", new { letter = letter });
}
This will save all those action links

Answer 2

#if(Model.Any())
{
foreach (var artist in Model)
{
<li>#Html.ActionLink(artist.Name,
"Browse", new { id = artist.ArtistId })</li>
}
}
else
{
<span>There are no artists</span>
}