Looping through image directory

Good Morning,

I am working on a script that loops through the image directory looking for images. I have the following code and it displays all of the images just fine, However, how can I limit the files to display?

For example what if I want to display just the images that start with 'abc'?
abc1.jpg
abc2.jp
abc3.jpg
etc. etc.

[code]
foreach(FileInfo file in files)
{
blah...
blah...
}
[/code]

Thanks in advance.Maybe this can be of some help:

 private void Button1_Click(object sender, System.EventArgs e)
 {
 if(this.TextBox1.Text.Trim() == "")
 {
 Response.Write("Please enter a search critera");
 return;
 }
 string crit = this.TextBox1.Text.Trim();
 string files = "";
 DirectoryInfo di = new DirectoryInfo(@."C:\myImageFolder");
 foreach(FileInfo fi in di.GetFiles(crit + "*.*"))
 {
 files += "<li>" + fi.Name;
 }
 this.Label1.Text = files;
 }

That works!

Thank you!