ASP.NET Refresh the page after uploading image

I have an ASPX page where I am uploading an image to server for on a serverside button click event. In my page, it will show the available image if it exists. When I upload an image, it will replace the old one with the new one. Now after uploading also the same image is getting displayed. How can tackle this? I used window.location.reload() javascript function to refresh, but then it is not working. It is posting the page again.

This is my code

    Do UploadImage(studentId,mode);  // Function to upload image
    StringBuilder sbc = new StringBuilder();

    sbc.Append("<script language='javascript'>");
    sbc.Append("alert('Upload process completed successfully!');");
    sbc.Append("window.location.reload()");
    sbc.Append("</script>");
    HttpContext.Current.Response.Write(sbc);

Solution

It's being cached in the browser. To overcome this - alter the url of the image. This can be done by including a timestamp, version number, or guid in the image file name.