刪除某一目錄的某一檔案

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using System.IO;

protected void Page_Load(object sender, EventArgs e)
{                      
 DirectoryInfo dirinfo = new DirectoryInfo(MapPath("~") + "ExportMapImg");
        FileInfo[] sortList = dirinfo.GetFiles();                       
           
        string fName = "XX.txt";           
        foreach (FileInfo item in sortList)
        {
         string ExistFile = item.FullName;
                Response.Write(ExistFile + "<br>");
                if(ExistFile.IndexOf(fName, 0)!=-1){
                    Response.Write(ExistFile + " *****delete!! <br>");
                    System.IO.File.Delete(ExistFile);
                }
 }       
}