Save Image Files to Database using ASP.Net AJAX AsyncFileUpload Control

Hi

I used this code to uploading image and insert it to database

  string path = Server.MapPath(".") + "\\../Upload\\";

        string[] validext = { ".jpg", ".gif", ".png", ".rar" };
        string ext =
            System.IO.Path.GetExtension(AsyncFileUpload1.PostedFile.FileName);
        if (Array.IndexOf(validext, ext.ToLower()) < 0)
        {
            lblMessage.Text = "File format not recognised. Upload Image/";
            return;
        }

        //4-Get File Name
        string filename = System.IO.Path.GetFileName(AsyncFileUpload1.PostedFile.FileName);

        //5-Get File Exist and if (true)Generate New Name
        while (System.IO.File.Exists(path + "\\" + filename))
            filename = "1" + filename;

        //6-Save File to Server


        AsyncFileUpload1.PostedFile.SaveAs(path + filename);

        SqlCommand _cmd = new SqlCommand("Fileup1", _cn);
        _cmd.CommandType = CommandType.StoredProcedure;
        _cn.Open();
        _cmd.Parameters.AddWithValue("@image", AsyncFileUpload1.FileBytes);
        _cmd.Parameters.AddWithValue("@Behcode", "6666");
        _cmd.ExecuteNonQuery();
        _cn.Close();

my problem is that it didn't insert image name in database it save some unknown Characters in database 

so when i want bind my image from database it didn't show image .