Browser cache problem ( Images not updating ) in ASP.Net

Iam creating a web page for uploading & displaying an image from database.. my images are inserting perfectly in byte format into database, and display images is also working well, here my problem is when you upload a new image,  it is displaying the same old image, here's my code for displaying a image from database on click of display button..

SqlConnection connection = new SqlConnection(ConfigurationManager.AppSettings["connstring"]);
            SqlCommand command = new SqlCommand("SELECT * from [Imagetab]", connection);
            SqlDataAdapter da = new SqlDataAdapter(command);
            DataSet ds = new DataSet();
            da.Fill(ds);
            Image1.ImageUrl = "ImageHandler.ashx?ImageID='" + ds.Tables[0].Rows[0][0].ToString() + "'";
            Image1.Visible = true;

here i am using an image handler, and the code is as below..

string imageid = context.Request.QueryString["ImageID"].ToString();
            
            if (imageid != null)
            {
                cmd.CommandText = "select ImageName from Imagetab where ImageID=" + imageid + "";
                cmd.Connection = con;
                con.Open();
                bytImage = (byte[])(cmd.ExecuteScalar());
                con.Close();
                context.Response.BinaryWrite(bytImage);
            }

here, i cant understand, how to clear the cache or how to get new uploaded images,   any help will be thankful..