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How to open excel 2007/2010 on browser by using .ashx?
<a href="test.htm" target="_blank">Export</a>

<iframe src="handler1.ashx" style="height: 421px; width: 800px" ></iframe>

void ProcessRequest(HttpContext context)
    {

        string filePath = "E:/test.xlsx";
        string filename = Path.GetFileName(filePath);
        context.Response.Clear();
        context.Response.AddHeader("Content-Disposition", "inline;filename=test.xlsx");
        context.Response.Charset = "";
        context.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
        context.Response.WriteFile(filePath);
        context.Response.Flush();
        context.Response.End();
    }

context.Response.Write(YourExcelData);