ASP.NET

public static string AutoLink(string text)
{
    return AutoLinkRegex.Replace(text, match =>
    {
        string link = match.Value;

        // Remove trailing periods:
        int length = link.Length;
        int index = length;
        while (index > 0 && link[index - 1] == '.')
        {
            index--;
        }
        if (index != length)
        {
            link = link.Substring(0, index);
        }

        if (link.StartsWith("www.", StringComparison.OrdinalIgnoreCase))
        {
            return "<a href=\"http://" + link + "\">" + link + "</a>";
        }
        if (link.StartsWith("ftp.", StringComparison.OrdinalIgnoreCase))
        {
            return "<a href=\"ftp://" + link + "\">" + link + "</a>";
        }

        string protocol = match.Groups[1].Value;
        if (!string.IsNullOrEmpty(protocol) && protocol[protocol.Length - 1] == '@')
        {
            return "<a href=\"mailto:" + link + "\">" + link + "</a>";
        }

        return "<a href=\"" + link + "\">" + link + "</a>";
    });
}

private static readonly Regex AutoLinkRegex = new Regex(
    @"\b((http://|https://|ftp://|mailto:|news:)|www\.|ftp\.|[^ \,\;\:\!\)\(\""\'\<\>\f\n\r\t\v]+@)([^ \,\;\:\!\)\(\""\'\<\>\f\n\r\t\v]+)",
    RegexOptions.IgnoreCase | RegexOptions.Singleline);

YourFunctionToUploadImage()
{
  //Check FileUpload controll has File Or not
  if (ImageFileUploadControll.HasFile)
  { 
         string fileExtention = System.IO.Path.GetExtension(ImageFileUploadControll.FileName);
         //Check For Valid Extension
            if (fileExtention.ToLower() != ".jpg" && fileExtention.ToLower() != ".jpeg" && fileExtention.ToLower() != ".png")
            {
                lblUploadstatus.Text = "Invalid File Choose .jpg/.jpeg/.png/.gif";
            }
            else
            {
                    //check if file already Exists in Folder
                    if (File.Exists(Server.MapPath("~/Folder_Name/" + ImageFileUploadControll.FileName)))
                    {
                        lblUploadstatus.Text = "File Already Exists. Rename filename";
                    }
                    else
                    {
                        //To Save Image To your Specific Location.
                        //srever.mappath takes us to Folder which containing our application
                        ImageFileUploadControll.SaveAs(Server.MapPath("~/Folder_Name/" + ImageFileUploadControll.FileName));
                        lblUploadstatus.Text = "Upload Status : File Uploaded Successfully";
                    } 
            }
            
   }
   else 
   {
      lblUploadstatus.Text = "Please Select File";
   }
}

PageLoadEvent()
{
    //use DirectoryInfo to get all imageFile's Information
    DirectoryInfo dir = new DirectoryInfo(Server.MapPath("~/Folder_Name/"));
    FileInfo[] fi = dir.GetFiles();

    //Now you just need to create new image control each time and add ImageUrl to it
    foreach(FileInfo f in fi)
    {
         string imageUrl = f.ToString();
         Image img = new Image();
         img.ImageUrl = "~/Folder_Name/"+"imageUrl";
    }
}