How to control the size of image while saving to folder

string filename = Path.GetFileName(fileuploadimages.PostedFile.FileName);
//Save images into SlideImages folder
fileuploadimages.SaveAs(Server.MapPath("Images/" + filename));
//Open the database connection

string conn = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
MySqlConnection con = new MySqlConnection(conn);
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = con;
cmd.CommandText = "Insert_Image";
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("?description", "abc");
cmd.Parameters.AddWithValue("?fullstr", filename);

con.Open();
cmd.ExecuteNonQuery();
cmd.Connection.Close();
BindDataList();