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 <input id="fileToUpload" type="file" name="fileToUpload" /> <input type="button" id="buttonUpload" onclick="return ajaxFileUpload();" value="Upload" /><img id="loading" src="/Content/loading.gif" style="display: none;" />

function ajaxFileUpload() {    $("#loading")    .ajaxStart(function () {        $(this).show();    })    .ajaxComplete(function () {        $(this).hide();    });    $.ajaxFileUpload({        url: '/File/Upload',        secureuri: false,        fileElementId: 'fileToUpload',        dataType: 'json',        success: function (data) {            alert(data.msg);        },        error: function (data) {            alert("error");        }    });    return false;}

[HttpPost]public JsonResult Upload(){    string filename = string.Empty;    if (Request.Files["fileToUpload"] != null)    {        filename = Request.Files["fileToUpload"].FileName;        Stream st = Request.Files["fileToUpload"].InputStream;    }     return this.Json(new { err = "", msg = "xxx.jpg" }, "text/x-json");}