i need to display button along with response.write

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ASP.NET

I am saving image file into the database as binarydata and retrieving the image file from the database. I am using response.write() to display the image file.
The problem is response.write() clearing all the label,button,textbox fields in my page.But i need button in my page to increase the count.
CODE:

protected void btnsave2_Click(object sender, EventArgs e)
       {
           imag++;
           byte[] imagebyte = new byte[FileUpload1.PostedFile.InputStream.Length + 1];
           FileUpload1.PostedFile.InputStream.Read(imagebyte, 0, imagebyte.Length);
           cmd = new MySqlCommand("Insert Into db_image (Image,ImageId) values (@imag,@imageid)", con);
           cmd.Parameters.AddWithValue("imag", imagebyte);
           cmd.Parameters.AddWithValue("imageid", imag.ToString());
           cmd.ExecuteNonQuery();


       }

protected void btnretr2_Click(object sender, EventArgs e)
       {
           cmd = new MySqlCommand("Select Image from db_image where ImageId='" +txt_imageid.Text.Trim()+ "' ", con);
           dr = cmd.ExecuteReader();
           while (dr.Read())
           {
               Response.BinaryWrite((byte[])dr["Image"]);


           }
       }

Help me.