save image sent from android application

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C#

in my case i develop an aspx page to receive a parameter in url this parameter is stringbase64
then i convert the parameter value to array byte[] to save it on the drive

when i run the page local and give it in the url base64 of an image it works well
but when i call it from the server give me error 404 - File or directory not found.


here is the HTML code and C# code

protected void Page_Load(object sender, EventArgs e)
{
    if (Request.QueryString["image"] != null)
    {
        string imagestring = Request.QueryString["image"];
        //LoadImage(imagestring);

        var c = HttpContext.Current;

        string imagepar = c.Request["image"];

        var base64 = c.Request["image"];

        LoadImage(base64);
    }
}

public void LoadImage(string img)
{
    byte[] bytes = Convert.FromBase64String(img.Replace(' ', '+'));

    Random Ran = new Random();
    string AddToName = DateTime.Now.Day.ToString()
                       + DateTime.Now.Month.ToString()
                       + DateTime.Now.Year.ToString() 
                       + Ran.Next(199999);

    try
    {
        System.IO.File.WriteAllBytes(@"F:\940Attached\img" + AddToName + ".jpg", bytes);
    }
    catch (Exception ee) { Response.Write(ee.ToString()); }

}