ASP.NET Refresh page after image is loaded

I have an ASPX page where I upload an image to the server for a server click event. On my page, it will show the available image if it exists. When I upload the image, it will replace the old one with the new one. Now the same image is displayed after loading as well. How can this be solved? I used the window.location.reload () javascript function to update, but then it doesn't work. He publishes 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);