retrieve image from database

Question

protected void btnUpdate_Click(object sender, EventArgs e)

{

string id = Request.QueryString["id"].ToString();

string qry = "update appformtbl set can_name=@can_name,fath_name=@fath_name,photo=@photo,sign=@sign,pass_gra=@pass_gra where id=" + id + "";

SqlConnection con = new SqlConnection(connection);

SqlCommand cmd = new SqlCommand(qry, con);

if (image1.HasFile)

{

image1.SaveAs(MapPath("~/Rimage/" + image1.FileName));

System.Drawing.Image img1 = System.Drawing.Image.FromFile(MapPath("~/Rimage/") + image1.FileName);

NormalImage.ImageUrl = "~/Rimage/" + image1.FileName;

}

else

{

var preimg = cmd.Parameters.AddWithValue("@photo", image1.ToString());

if (image1!= null)

{

preimg.Value = image1.FileName;-

}

}

 

cmd.Parameters.AddWithValue("@photo", SqlDbType.NVarChar).Value = image1.FileName.Trim();

 

my problem:- hello friends, when i am updating new image then show in table but without change image click on update button then not find previous image...  how to do it??? please help me.. thank you