how to save images to mysql database and after saving it has to be displayed in the same

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ASP.NET

MySQL

Helo

Iam designed an form in view page which looks like

<div id="dialog" title="Upload files">
    @using(Html.BeginForm("Upload","Image", FormMethod.Post, new {id="photouploadform", enctype = "multipart/form-data" }))
    {
        <p><input type="file" id="fileUpload" name="fileUpload" size="23"/> </p><br />
        <p><input type="submit" value="Upload file" /></p>
        <input type="hidden" id="Id" value="1" />
    }
</div>

<script type="text/javascript">
    $(function () {
        $('.photoupload').click(function (event) {
            $('#userid').val(event.target.id);
            $('#dialog').dialog('open');
        });

        $('#photouploadform').submit(function () {
            $.getJSON("/Image/Upload/", {
                userid: $('#Id').val(),
                file1: $('#fileUpload')
            },
            function(success){
            alert(str.st)
            },
            function (data) {
                $('#dialog').append('<p>' + data + '</p>');
            });
            return false;
        });

        $("#dialog").dialog({
            autoOpen: false,
            show: "blind",
            width: 400,
            hide: "fade",
            modal: true,
            resizable: false

        });

    });
</script>

In my controller i give like

public ActionResult Upload(int userid,HttpPostedFileBase file1)
       {

           Image g = new Image();
           g.Userid = userid;

           if (file1 != null)
           {
               g.Image1 = file1;
           }

           try
           {
               this.dbContext.Add(g);
               this.dbContext.SaveChanges();
           }
           catch
           {

           }

           var str = new { st = "Successfully Saved" };

           return Json(str, JsonRequestBehavior.AllowGet);
       }

when i click upload it is showing server error
The parameters dictionary contains a null entry for parameter 'Id' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult Upload(Int32, System.Web.HttpPostedFileBase)' in 'Dataview.Controllers.ImageController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.
Can any one knows please tell me the solution